My 16-year-old daughter's Venture Scout troop is doing an eight-day horseback trek in northeastern New Mexico this July. They have to store all their gear in a large stuff sack (and two midget saddle bags), so she needs a lightweight, compressible sleeping bag to maximize space in the stuff sack. They'll be sleeping in tents at altitudes up to 12,000 feet, so the bag needs to be rated to around 30 degreesand affordable. Easy, right? Lou Oak Hill, Virginia
Mount Washington bags
Anyway, your daughter would do just fine with a light mummy bag like Slumberjack's Super Guide, which uses a synthetic fill called Thermolite (made by DuPont, so not a no-name product). Cost is only $70 (www.slumberjack.com). The Super Guide also weighs a very respectable two pounds, eight ounces. And, it has a nicely tapered shape that's efficient without being too constrictive. In my experience, Slumberjack bags are slightly overrated temperature-wise, but in this case I think it would work fine.
At the top of the heap would be the Marmot Arroyo ($259; www.marmot.com). This is a superb bag rated conservatively to 30 degrees, complete with down fill that's longer lasting and softer than synthetic. It's also lighter; the Arroyo weighs about two pounds.
For any bag, you can easily reduce its volume with a compression stuff stack. This is simply a nylon stuff bag that has extra straps that can be cinched to squeeze the thing down. Kelty makes an 8-by-17-inch sack, which could handle any of the bags I just mentioned, that sells for only $17 (www.kelty.com). It'll take a bag that's the size of a small watermelon when stuffed and turn it into a cantaloupe.