I'm moving in two weeks' time to a small island in Micronesia to teach for a year, and I've been told we will have no running water or electricity. Could you recommend an air mattress or cot that will last nine months and be pseudo-comfortable? How about reliable solar-rechargeable batteries? Or a sturdy water purifier/filter? Or anything else for that matter, as I'm at my wit's end! I will mail you coconuts and other treats from the Marshall Islands. Jourdan Mii, Florida

As the years go by, my wife and I find ourselves looking for lighter and lighter hiking and camping equipment, especially in terms of our shelter which takes up a significant portion of our pack weight. What's the word on Henry Shires' Tarptents? Their Squall weighs only 24.5 ounces and offers two people a roomy 44 square feet of space. Could this be the lightweight remedy to aching backs and our three-season shelter needs? V. Tran Galveston, Texas

My 2003 hiking season shall henceforth be known as the "Summer of the Bee," for all the stings I got. The long spell of dry weather was suggested to me as a reason, which I liked better than bad karma! Anyway, I quickly used up the three sting wipes in my first-aid kit and now own both REI's Sting Eze and After Bite. To my surprise, these two products use completely different active ingredients. Which one works best on stings? Chris Silverdale, Washington

I've finally decided to buy a GPS unit. My problem? I don't know which one. Your last review that I can find is three years old, but obviously a lot has changed since then. Rick Lebanon, Tennessee

Luckily, my company is relocating to a place where I'll be able to ride to work! What will I need to commute by bike three or four times weekly? I already have road and mountain bikes, plus the gear, but I don't think my racing garb will work for the daily commute. Loehr Athens, Georgia

I'm so confused by the different possibilities and terminology when it comes to rain jackets for biking. I bought a "waterproof" one, but it wasn't and I got soaked. I bought another and sweated so much that I wished I had the previous jacket. What's a good lightweight jacket for cycling that will keep me dry in moderate rainstorms? Mary Itasca, Illinois

What pants would keep me dry, breathe well, and shed plenty wind, all for under $100? I've had my eyes on Marmot's Precip pants, but what do you think about these? Are there other pants I should be looking at instead? On another tack, I assume you're a member of the Doug Club—oh no, have I given the ge away? Doug New York City

As a longtime reader of your column, you have helped me in the past. Now I need your advice again. I'm considering purchasing a canoe for family camping trips, something stable for small lakes and smooth rivers, nothing too extreme. What do you suggest in terms of size, length, and weight? Also, what type of carrying rack will I need for a shell-equipped Toyota pickup? John Springville, Utah

What's the story on titanium cooksets? A friend of mine has one from MSR and while it's super light, it doesn't seem to heat up as rapidly as my stainless steel set. I like the lightness of titanium, but if I have to bring 50 percent more fuel to cook with, I'm not sure it will be worth the price premium. Steve Young Mountain View, California

Is it necessary to waterproof Gore-Tex boots with something like Nikwax's Aqueous Wax Waterproofing? Mike St. Paul, Minnesota

What's going to be the coolest new gear for 2003? The reason I ask is that I want to buy my boyfriend a really unique Christmas gift. He loves the great outdoors, but is still using his ten-year-old boots and ratty old backpack when we go hiking. I know he'd love to be the coolest hiker on the trail! Caroline Santa Fe, New Mexico

This may be a "gear-related question" with a "you don't need gear for that" answer, but I can't find help on this anywhere. I often hear that running on the beach is one of the most effective ways to boost strength and endurance in your legs. I want to start doing this on a daily basis, and I'm wondering what kind of shoe/sneaker I should you wear. Or do I need to wear anything at all? Mark Brick, New Jersey

Do you have any tips, or can you recommend any sources of information, on how to remove tree sap from the outside of a Goretex XCR shell? Thanks!

O Most Knowledgeable One, what wind pants should I get: the L.L. Bean Guide Pants, made of Schoeller Dryskin, or the Marmot DriClime Stretch Pants? Your pearls of wisdom about the differences in performance are sought. Bill Charlottesville, Virginia

I was looking to buy a general, all-purpose, quality, hardwearing watch for travelling, hiking, work etc and was wondering if you could recommend one. I was looking at Suunto watches but unsure of their quality. Can you recommend a watch for me? Brendan Melbourne, Victoria, Australia

All-Knowing Gear Guy, I'm looking at buying a Marmot Pinnacle down sleeping bag and can't decide whether I should get it with the regular shell or with Dryloft. I enjoy sleeping outside (on a pad) when I can, and concerned about dpness if I were to do this over many days. Yet if I were to use it (unzipped!) in humid environments, I'm afraid a Dryloft shell might not provide enough breathability for the bag to stay dry and mildew-free over time. Any suggestions? Zach Isaacs Glendale, California

I looking for a parka for winter camping in New Hampshire. I have narrowed it down to the Feathered Friends Frontpoint and the Wild Things Belay Jacket. How does the warmth of the Belay compare to a high-quality down piece such as the Frontpoint? Which would you recommend for New Hampshire winters? S Portsmouth, New Hampshire

I know you're not supposed to store your sleeping bag stuffed, but I need something to contain it in while I not using it. Will a garbage bag work, or should I buy some kind of mesh bag for it? Sarah New Canaan, Connecticut

I'm planning a summit attempt on Mount Rainier this August and a possible bid for Denali in May 2004, so in the process of upgrading my gear, particularly boots and sleeping bag. My budget may not allow for separate gear for each climb. I've been looking at Millet's Everest Boot and the North Face Inferno bag as my options, but prices are steep! Do you have any other suggestions, and is this gear suitable, or even overkill, for both climbs? Michael Stoneh, Massachusetts

What are the best winter socks for snow skiing? When I ski, I rent boots and skis, but I find my feet always get cold. What socks should I get to make sure my feet stay warm? Should I use sock liners in addition to high quality wool socks? Brad Chapel Hill, North Carolina

Hailing from sunny California, this is my first year in college in Boston. Here's my situation: New England weather is windy, chilly, and often wet. I need a jacket that will get me through the winter but also look good around town. However, once I buy this jacket, I'll still need money to eat. What can you recommend that won't break the bank, i.e. as close to $100 as possible? Kyle Boston, Massachusetts

So, after a year or so of ultra-light backpacking, my wife and I are starting to bring my son along, which means I need a huge pack to haul accommodation for three. Should I splurge and get a high-volume expedition pack like a Bora 95 or Gregory Denali, or are one of the new generation of external-fre packs (like Kelty's 50th anniversary edition) better value? We'll be mostly on trail, but I'm not sure if the lower-priced packs will provide enough comfort over a few days. Robert Granada Hills, California

I guess this might be more of a biological or physiological question than a straight gear question, but I notice that when I sip water from a CelBak, I have to "go" less than if I take bigger yet less frequent gulps from a water bottle. It seems that even drinking a full 70 ounces from my CelBak, compared to a quart from a bottle, is easier on my bladder. I just imagining this? Does the body better optimize water that's sipped slowly? Bill Bedford, New Hampshire

Not really a gear question, but can you tell me about all the pre-packaged trail food on the market? What have you tried? What's the best? Also, do you know of any Web sites with a good selection of trail recipes, especially vegetarian? Melissa Greenwood, Delaware

I'm planning on through-hiking the Pacific Crest Trail and would like to keep my pack weight as low as possible without sacrificing comfort. When I through-hiked the Appalachian Trail in 1990, my pack weight was around 50 pounds, including food and water. I have heard that ultralight packs are not very comfortable with loads over 20 pounds. Can you recommend a lightweight backpack for my hike? Cliff Ashford, Alabama

I'm gearing up for an ascent of Denali in May 2002. Could you advise for clothing and size of compression sacks appropriate to bring? I weigh 114 pounds so I want to minimize what I have to pack. Jeanne Stawiecki Charlton, Massachusetts

I'm hiking the Grand Canyon rim to rim this spring, and I'm wondering what footwear to use. I like the lightness and cushioning of the trail runners that I've been using for my ten-mile training hikes, but I'm wondering if I need something a little more burly for my unsteady legs over the course of the 24-mile hike. Any thoughts on the Lowa Tempest? Jay Phoenix, Arizona

What's the best way to clean my hands in the wilderness prior to handling contact lenses? My waterless hand sanitizer warns against eye contact and I don't want to use stream water.

My daughter is flying to Europe this fall and is looking for a good all-around pack for all travel essentials, plus a computer. She is small-fred, five-feet four-inches tall, and weighs 110 pounds. This is the only luggage she is taking and she plans on being there five months. The packs needs to be durable and easy to carry. What should she be looking for? Janet Boise, Idaho

I know it's only August, but I have recently taken up running and looking ahead to the looming Ottawa winter. In preparing to outfit myself, I have been doing some reading about soft-shell jackets. The claim seems to be that I won't need to do the usual layering job with one of these—the soft shell can do it all. Is this right? Would a soft shell be the answer to a big part of my winter running wardrobe? Eric Ottawa, Ontario

Because of a small fire in our house I need to have three down sleeping bags, a jacket, and a vest cleaned. I need some suggestions of companies that will handle this operation and do it correctly. I may find other equipment and clothes as the clean up process progresses that need cleaning also. The smell smoke and soot of a house fire is not the se as that of a campfire! Gary Johnson Collegeville, Pennsylvania

What is meant by the minimum weight on tent specifications? S Weatherley Birmingh, United Kingdom

I plan to buy a bike for my wife, a long-overdue birthday present, to be used mostly on backcountry roads (gravel, dirt, or tarmac) but not on trails. I'm looking for something that is good quality and will be comfortable for a 30-mile ride. A racing bike seems too fragile, while the ubiquitous mountain bike seems like overkill. Is a hybrid (whatever that is!) the way to go? I really require your guidance, as this gift is somewhat late. Steven Westmount, Quebec

I have logged many air miles with my MSR Whisperlite AND empty fuel bottles. I have never been given any problems (including post 9-11 from New York area airports) having them packed in my luggage. I do, however, take a couple of precautions. These include calling the airline before hand and getting the name and customer service ID of the person I talked to, keeping the fuel bottle clean and uncapped (leave some soap residue inside so it will smell clean), and always checking in at the counter so you can tell the attendant that that the thing that looks like a bomb is a stove and bottles. Most of the time the attendant checks the equipment and that is all (sometimes they mark my luggage with a weird tag). I have on other occasions had an attendant repackage the stove in the airline's special box. I feel that if you are up front about it and take a little care, things will go smoother. However be prepared for the guy who is a hard nose as you may still lose your stove. Jonathan Cushing New York, New York

I'm in the market for a decent down jacket but don't want to fork over the money for a Feathered Friends Rock & Ice Parka, as good as it is. What do you know about the Frobisher 700 Parka from Mountain Equipment Co-Op (a Canadian company)? It's stuffed with about 16.5 ounces of 700-fill down, has a Dryloft shell, and sells for about $285. It seems like deal to me! But I'm curious how it stacks up against Mountain Hardwear's Sub Zero SL Parka. Any help would be greatly appreciated. Michael Gebhardt Chattanooga, Tennessee

Gear Guru: I work out almost every day, so I need a lot of base-layer garments. When it's not too cold out, my CoolMax Alta turtlenecks seem a good deal. But what about the other, pricier options? Do these have wondrous additional capabilities worth the extra cash? David Portland, Oregon

Raichle's Mountain Trekker backpacking boot is the best boot I have ever owned, and I would like to purchase another pair. However, I can't find anyone that carries them anymore. Could you help me out with information on where I could get a pair? Trevor Calgary, Alberta

I read the article about the Crawford Survival Staff in the 2000 Buyer's Guide, but I wanted to ask if it's really worth the $225. You're the only source of reliable information I have! Did you actually field-test the staff? Alex

I'm planning a 14-day backpacking trip down Utah's Escalante River next month, and puzzled about the ideal footwear to pack. The route involves lots of wading, often over rough riverbeds, as well as slickrock hiking, all while lugging a big pack. Is there a boot out there that can provide good drainage as well as some serious support? David Grinnell, Iowa

How do I get Christmas-tree pitch out of a Gore-Tex jacket? Karen Gresh, Oregon

Oh Gear Guide, you have failed us! Over and over I have heard you espouse the quality of the Yashica, so I decided that the T4 was the camera for me. Unfortunately, after hours of searching, I find out that the T4 has not been made for years! Just recently, you suggested the camera but didn't mention that it would be impossible to find. With the T4 no longer on the market, what kind of camera would you suggest? Mike Newark, Ohio

I'm a self-proclaimed "active" person striving to be at least mediocre at several "outside" activities, such as mountain biking, kayaking, backpacking, etc. I have a Ford Ranger truck, and finding it quite a challenge to figure out how to fit all my stuff on there -- with more than one person coming along, it gets really tricky! I'm wondering what the best way to transport kayaks on my truck would be. I have an aluminum truck box already taking up half of the bed (placed lengthwise on the driver side). I have mounts to put two bikes on the other side of the box in the bed. But how will I carry a kayak? Help! Owen Fennern San Jose, California

For a very long time I've been looking for a camera to take backpacking. I messed around with digitals, but decided they were not practical and didn't have a good enough zoom for my purposes. So, now I'm looking to get an SLR. Do you have any recommendations on a good camera and some good lenses for an amateur not wanting to bother with tons of manual setup? Benjamin Tempe, Arizona

Do you think the Bibler's Tempest is too much tent for Oregon's Mount Hood? I'm looking for a four-season tent in the $400 to $500 price range. I plan to live in it for a while (at least three to four months) as a volunteer. Joe Venice, California

Is it necessary to waterproof Gore-Tex boots with something like Nikwax's Aqueous Wax Waterproofing? Mikebr>St. Paul, Minnesota

I'll be skiing in the Austrian Alps this winter. What's the essential gear for avalanche safety? We're not all supported by James Bond-level technology, but I was wondering what sort of equipment you'd recommend for going off piste. Brian York, United Kingdom

I have been hearing about MSR's lightweight and very compact Pocket Rocket stove. But the fuel for it seems to weigh a lot more than the white gas that I use now for my MSR Whisperlite. Is the fuel for this new breed of stoves heavier than other fuels? And if so why does everyone think they are saving so much more weight when they are making up for it in the weight of the fuel? Justin Strasburg Lincoln, Nebraska

Your Gearness, I started mountain biking about two months ago and bought a Gary Fisher Tassahara. I bought all of the needed accessories—Celbak, spd shoes, and clipless pedals—but have a question regarding shorts. I bought three pairs of six-panel Lycra shorts and love them. But, I see a lot of mountain bikers wearing baggy shorts. What do you think of them? I tried a pair of Zoic Vigor shorts and the Lycra liner's pad felt thin. What do you think about just using the six-panel short and putting knee length Cordura hiking short over them? Patrick Fetizanan Chicago, Illinois

Hola Señor Gear: After ten days of tromping in the Peruvian rainforest in borrowed rubber boots, my insteps are bruised from roots and stumps and my toes want to grip the inside of my shoes for stability. Yet, I'm convinced that rubber boots are the only way to go in jungle conditions. Are there rubber boots with hiking boot soles and at least a little support for the ankles? Bob St. Louis, Missouri

My fiancC) has an old REI dome tent that she loves and always insists on bringing, though I'm convinced, because of its age, it's destined to soon become just some tattered prayer flags along the trail and leave us shelterless. She doesn't like any of the current tent designs because their vestibules completely protect the door and prevent you from being able to easily watch the rain. The REI dome is great because its door has two parts—a screen door and ripstop nylon door that you can zip part of the way up to keep rain out. Does anybody still make a dome tent like this? Mark Scantlebury Portland, Oregon

Dear Gear Guy, I longtime winter outdoorsman, but a winter and alpine camping beginner. I bought a -5-degree Polarguard 3D bag that I've slept in at temperatures ranging from 15 to 30 degrees in high-quality tents and on a (cushy) RidgeRest/Therma-Rest combo, albeit on snow—and I always freeze, if not right away, then definitely by 3 A.M. I wear at least two layers, often my third, hat, etc. Short of wearing my outer layer (!!) or my belay jacket/pillow to bed, what gives? I just in kick-ass shape (no insulation layer) or just a total wimp who needs to buy a warmer, heavier bag? Or is there something about temperature ratings that I'm missing? Bill New York, New York

I'm looking for a sleeping bag to use mainly for summer backpacking in the Northeast, something that's less than two pounds with a temperature rating down to about 30 degrees; I'd also really like a full-length zipper, so I can unzip the bag on those warmer nights. I've always enjoyed your gear wisdom, so I'm looking forward to any suggestions you might have. Kevin Boston, Massachusetts

What clothes should you sleep in when backpacking? I mostly go in southern California during spring or fall, so temps can dip to 30 degrees at night, but not much lower. Generally, I wear whatever I change into once we make cp, but I've begun to wonder if I should dress more warmly to bed and rely less on a heavy sleeping bag. Christopher Simi Valley, California

I'm fairly well equipped for three-season travel with a Lowe pack, Merrell boots, a Sierra Designs down bag rated to -5, a 3/4-length Therm-a-Rest, and two tents: Mountain Hardware's Glacier and the Slickrock from The North Face. But on a recent June trip in the B.C. backcountry, I pitched the Slickrock on a snowfield and the down bag got wet. What do I do to remedy the situation? Buy a synthetic bag, or a down bag with at least a partial waterproof shell? Buy a full length Therm-a-Rest, which keeps the whole bag off the ground? Get a person four-season tent? Where do I throw my hard earned (and continually depleting) gear dollars? Scott Nelson Vancouver, British Columbia

I'm looking for a boot that is automatic crampon compatible. Also, I'd like it to be a very well rounded boot—I need it to be able to go on extended backpacking trips and even some vertical ice climbing. What is my best choice? Dan Charlton, Massachusetts

I want to buy some new cross-country skis that I can use for both touring and downhill, maybe something along the lines of the Karhu Catounts. While these seem to work well for touring on ungroomed trails, would these also suit for telemarking on blue-square trails? Rusty Cresco, Pennsylvania

Can you recommend a good cross-country skiing package that's suitable for both groomed trails and backcountry use? John Duluth, Minnesota

I'm looking for an internal-fre backpack in the 4500- to 5500-cubic-inch range for less than $250. I need one with a torso length of at least 23 inches. Do you have any suggestions? Dennis McAllister Cleveland, Oklahoma

My husband and I just got a camera with a timer and remote control. We have a regular tripod, but need a good, compact tripod for hiking and backpacking. We've seen some that fold down to about cigarette-pack size, but are they any good? It's just a regular 35mm point and shoot camera, any recommendations? Linda Neve Incline Village, Nevada

I wear Levis to hike and cp in. (I'll pause here while you gasp in horror.) I'd cheerfully purchase better pants, but all the ones I've looked at feel like slacks. Slacks are for dress up, Levis are for work and play. This was drilled into my synapses many years ago and I'm too old to change. Is there a wool or synthetic pant out there that has the weight and feel of denim, which I can wear comfortably without offending the sensibilities of right-thinking outdoors folk everywhere?

When it comes to packing a backpack, I get lots of varying answers. What's correct, the weight at the top of the pack or at the bottom? Kristen San Diego, California

I have gotten into section hiking the AT and whenever I go and carry a fair load (more than 30 pounds) I come home with strawberries (abrasions) on my hips from the waist belts. HELP ME! Jeff Hatcher Mcleansville, North Carolina

As a frequent trail runner, I looking for a backpack designed with running in mind. I would like something with ple storage for additional layers and supplies, certainly larger than a lumbar pack. Any suggestions? Connor Ann Arbor, Michigan

Dear Gear Guru, Each year I spend more and more time engaging in technically demanding backpacking, backcountry skiing, and mountaineering trips into the remote backcountry. Due to my exposure, the natural dangers of the mountains, and the probability of accidents, the need for a reliable and durable communications system has arisen. Do you know of a system that has long-range communication capabilities and can withstand the needs of being both portable and durable? Is a satellite phone the answer? As always, I look forward to the wisdom of your responses. Sean Constine

I would like to buy a digital camera to bring on climbing, canoeing, and hiking trips. I had been planning to buy an SLR, but I've recently been tempted by digital cameras and their ability to make you impulsively take snapshots. What factors other then weight and picture quality should I consider? Any help you can give me would be much appreciated. Eric Winnipeg, Manitoba

I've collected the very best ensemble of outdoor gear, but I still require one last item: sunglasses! Price is no object, but quality is. I need the best all-purpose outdoor fres that are compatible with prescription lenses. Cebe comes to mind, but do you have any other suggestions? Paul Boulder, Colorado

Oh Great Gear Voice of the Heavens, What's a nice, dry, two-person, three-season tent with two doors and vestibules? My current tent is a Sierra Designs Orion AST. It's a very well built tent and stayed completely dry in a very wet trip to Deer Lake in Olympic National Park. I like being able to use only the rain fly and ground sheet as well as the window in the fly. The problem is that the very slanted door lets stuff collect in the tent entrance and makes zipping and unzipping tough. It also makes the vestibule useless for anything but boots. I hope to get a new tent with two doors that are straight up and down, but don't want to lose the high quality and rain-proofness. I willing to give up a little in weight if I could get a ground sheet that covers the floors of the vestibule as well. Chris Barnes Bremerton, Washington

I've been skiing for years and haven't needed to buy new thermal underwear in a long time. But now that I'm ready to replace it, several new materials are on the market. I know I don't want cotton, but what about silk? Wool? Or should I just stick with polyester? y Kuntz California

I'm looking for a mountaineering boot for tackling some of the Lower 48's fourteeners. I've reviewed the Koflach Degre and the Asolo Guide, but I'm also interested in some of the newer leather boots, like the Scarpa Cerro Torre Thermo. Have the new insulated leathers finally become an acceptable solution, or should I stick with doubles? Matt San Ron, California

Are candle lanterns safe to use in tents for light? Obviously you'd want to keep an open fle away from the tent walls, but are they as safe as a battery-powered lantern? John Bergquist Corvallis, Oregon

I'm 55 and like to ride bikes. Here near Lake Michigan in late spring, it's often sunny and cool. I see a lot of die-hard bikers wearing tights, but I'm not interested...is there anything else I can wear? I tried tennis warm-ups, but they're too slippery on the bike seat. Stu Highland Park, Illinois

What's the best crampon for the LaSportiva K3 boot? Can I use semi-rigid crampons with them to climb vertical ice? I need crampons for that and glacier approaches but am afraid that if I get a fully rigid crampon I will get to much balling-up effect with the snow. Joe Roop Prescott, Arizona

I have a 15-year-old Peak 1 stove that still works great. I was wondering if I could use cheaper unleaded gasoline (about half the price of Coleman fuel) without blowing me or my friends up. Or do I need to get a newer model made for both white gas and gasoline? J. D. Craft Lancaster, Ohio

I have a simple question. I dried my jacket on a high temperature in the dryer. Everybody tells me I shouldn't have done this, but how will it affect my jacket? Adrien Lancaster, United Kingdom

G'day Gear Guru, I've noticed a couple of innovative water-purifiers that incorporate the filter mechanism directly into the cap of a light, convenient, and squeezable water bottle. Models by Orinoco and SafeWater Anywhere make lofty claims of filtering and purifying the nasties better than traditional pump-style filters; the SafeWater model even has a filter cap that fits onto Nalgene bottles. Is there any point to lugging around our old pump filters anymore? Lange Sydney, Australia

Oh Gear Oracle, I have a problem with a build-up of moisture within my mittens, not from rain or snow, but from my own perspiration. This is especially true during snowshoeing trips. I was wondering if there are any shells that have little or no insulation, allowing me to layer them inside and increase the breathability of the mitten. Dennis Portsmouth, New Hampshire

Oh Gear Guide, you have failed us! Over and over I have heard you espouse the quality of the Yashica, so I decided that the T4 was the camera for me. Unfortunately, after hours of searching, I find out that the T4 has not been made for years! Just recently, you suggested the camera but didn't mention that it would be impossible to find. With the T4 no longer on the market, what kind of camera would you suggest? Mike Newark, Ohio

At what point, if ever, should your boots be replaced? Is it a question of mileage, time, or condition? I've had my boots (L.L. Bean Knife Edge, leather) for a number of years. They are well maintained and comfortable. Is there a point where the boot does not perform its support function and the trade off between comfort and support (in favor of comfort) is not worth it? Jim Comerford Wyncote, Pennsylvania

Your Gearness, I'm in desperate need of your expert advice. After two major knee surgeries involving saws, metal plates, and screws, I have suddenly become an advocate of trekking poles. I own a set of Master Kompressor poles with comfortable handles and a useful shock-absorber option. However, I've been tempted by a pair of Leki Ultralites, which are six ounces lighter but without the shock absorbers. At five-foot-one and about 120 pounds, do I really need poles with shock absorbers, or is it a waste of money for me? I have my sights set on the Grand Canyon this spring and would like to have time to "road test" a set of poles before then. Paula San Diego, California

I have been trying to decide between the PUR Guide water filter and the MSR MiniWorks, although I have heard that the MSR clogs less and is cleanable. However, the MiniWorks' high pump per liter ratio has turned me off, especially as the PUR Guide boasts a more efficient output. I will be using the filter mostly in high alpine areas where the water is fairly clear of mud and silt. What are your thoughts? Jim Huntsville, Utah