Top 10 list of the 10 essentials lists

REI 10 Essentials

http://www.rei.com/learn/expert-advice/ten-essentials.html

1 Navigation (map and compass)
2 Sun protection (sunglasses and sunscreen)
3 Insulation (extra clothing)
4 Illumination (headlamp/flashlight)
5 First-aid supplies
6 Fire (waterproof matches/lighter/candles)
7 Repair kit and tools
8 Nutrition (extra food)
9 Hydration (extra water)
10 Emergency shelter

Backpacker Magazine 10 Essentials

http://www.backpacker.com/november-2010-ten-essentials/slideshows/138

1 Headlamp
2 First-aid Kit
3 Sunblock
4 Trail food
5 Fire
6 Knife
7 Water
8 Insulation
9 Navigation
10 Rain gear

 Washington Trails Association (WTA) 10 Essentials

http://www.wta.org/hiking-info/basics/ten-essentials

1 Map
2 Compass
3 Water and a way to purify it
4 Extra food
5 Rain gear and extra clothing
6 Firestarter and matches
7 First-aid kit
8 Knife or multipurpose tool
9 Flashlight and extra batteries
10 Sun screen and sun glasses

Wikipedia 10 Essentials

http://en.wikipedia.org/wiki/Ten_Essentials

1 Map
2 Compass (optionally supplemented with a GPS receiver)
3 Sunglasses and sunscreen
4 Extra food
5 Extra water
6 Extra clothes
7 Headlamp and/or flashlight
8 First aid kit
9 Fire starter
10 Knife

 Boys Life (Boy Scouts of America) 10 Essentials

http://boyslife.org/outdoors/outdoorarticles/6976/scout-outdoor-essentials-checklist/

1 A pocketknife or multitool
2 First-aid kit
3 Extra clothing
4 Rain gear
5 Flashlight
6 Trail food
7 Water
8 Matches and/or a fire starter
9 Sun protection
10 Map and compass

 The Mountaineers 10 Essentials

https://www.mountaineers.org/learn/how-tos/the-ten-essentials

1 Navigation
2 Sun protection
3 Insulation (extra clothing)
4 Illumination
5 First-aid supplies
6 Fire
7 Repair kit and tools (including knife)
8 Nutrition (extra food)
9 Hydration (extra water)
10 Emergency shelter

National Park Service 10 Essentials

http://www.nps.gov/romo/planyourvisit/essentials.htm

1 Map of the area and compass
2 Extra food and water
3 Extra clothing, including rain gear
4 Sunglasses, sunscreen and hat
5 Pocketknife
6 Matches in a waterproof container and candle or other fire starter
7 Whistle
8 Flashlight with extra batteries and bulb
9 Space blanket
10 First aid kit

 Appalachian Trail Conservancy 10 Essentials

 http://www.appalachiantrail.org/hiking/hiking-basics/clothing-gear

1 A map and compass
2 Water
3 Warm clothing, rain gear, and a hat
4 Food
5 A trowel for burying human waste and toilet paper
6 A first-aid kit with blister treatments
7 A whistle
8 A Garbage bag to carry out trash
9 Sunglasses and sunscreen
10 A Blaze-orange vest or hat during hunting season

 Mazamas 10 Essentials

http://mazamas.org/about-us/mazamas-faq/

1 Whistle
2 Fire starter & waterproof matches
3 Map
4 Knife
5 Compass
6 First aid kit
7 Sun protection (lip balm, sunscreen and a hat)
8 Extra clothing (hat, socks, gloves)
9 Flashlight (with extra bulb and batteries)
10 Extra food

 Alaska National Park Service 10 Essentials

http://www.nps.gov/katm/planyourvisit/ten-essentials-for-backcountry-travel-in-katmai.htm

1 Appropriate footwear
2 Map and compass/GPS
3 Water and a water treatment system
4 High-calorie food
5 Rain gear and extra clothing
6 Safety items
7 Sunscreen and sunglasses
8 Bug spray and head net
9 Bear spray, flares, air horns
10 Backpack