That聮s an interesting and important question. The standard list, of course, is the classic 聯10 Essentials” pieced together by The Mountaineers in Seattle. C聮mon, class, let聮s all recite in unison:
Silva Ranger 515 CL

1. Navigation (compass and maps in a watertight case)
2. Sun Protection
3. Insulation (extra clothing)
4. Illumination (headlamp or flashlight with extra batteries)
5. First-aid kit
6. Fire (water-proof matches or butane lighter)
7. Repair kit and tools
8. Nutrition (no-cook foods)
9. Hydration (including filters)
10. Emergency shelter
These days, most lists add another two items:
1. Whistle
2. Food storage device
Exactly how you fill out this list is a matter of personal preference and experience. For a compass, for instance, I prefer old standbys such as the Silva Ranger 515 CL ($75; www.silvausa.com). Note that a GPS unit is NOT a reliable substitute for a compass for the simple reason that they require batteries, which can fail. For a first-aid kit, I make my own with a good supply of gauze, heavy dressings to absorb blood, elastic bandages, small tools to remove splinters and the like, Betadine antibiotic solution, anti-itch cream, antibiotic cream, Band-Aids, blister supplies, etc. Pre-assembled kits such as the 国产吃瓜黑料 Medical Personal Essentials First-Aid Kit ($39; www.adventuremedicalkits.com) are perfectly fine. And I usually carry a headlamp versus a flashlight, as it聮s easier to use hands-free. The Petzl Tikka XP ($45; http://en.petzl.com) is a reliable choice.
I think some people overlook emergency shelter, number ten, but it聮s worth paying attention to, particularly on day trips when you probably won聮t have a tent. A Gore-Tex bivouac bag is the heavy-duty solution (most run around $200). The Space Emergency Bag ($10; www.rei.com) is a cheaper, single-use substitute.
And never forget the most important item: common sense. That entails both the ability to forecast and avoid hazardous situations, and the willingness to pitch in and help when emergencies arise. An excellent book on this subject is Deep Survival: Who Lives, Who Dies, and Why by Laurence Gonzales. It goes deep into the psychology of backcountry survival and is a useful primer on how to pay attention to your mental state when a crisis emerges.
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