1. Everyone is always stoked to have a sip of hot tea or soup after a long day. I use an old, discontinued Outdoor Research thermos [we recommend Sigg's one-liter Thermo Basic Line, $35; sigg.ch]. Cheap thermoses don't work in the cold at all; I've tried many kinds. Get the most expensive one you can find and you'll get many hours of extra heat each day.
2. I like shea-butter lip balm because it doubles as sunscreen and is made from natural ingredients, instead of metals and chemicals. Karite Lips, by Mode de Vie [$8; modedevie.com], is my favorite. The main sunscreen I use is Organic Lavender SPF 30, by Alba Botanica [4 oz, $10; albabotanica.com]. It's water-resistant, works the best, and smells good.
3. I always have a first-aid and repair kit I assembled myself. I use a small toiletries bag and put in scissors, tape, gauze, and a few bandages. I also wind duct tape around a pen to make a small spool. Plastic zip ties are super-strong and can be used in case something breaks. In isolated places, I also carry a small, flexible splint.
4. My satellite phone paid for itself the very first time I used it to call for help. It seems expensive, but it's cheap life insurance. The one I use is by Qualcomm, and my subscription is with Globalstar. But I'm thinking about switching to Iridium [we recommend the Iridium 9505A, $1,000; iridium.com], which has more and newer satellites.
5. I bring a Freshette [$24; freshette.com], a little ergonomic funnel that you can pee into by just unzipping your fly. It has saved my ass from frostbite many times. You can even write your name in the snow.