While I think their list isn't too bad, I have to wonder about somebody who comes up with a "10 Essentials" list that has over 20 items on it like this one does. Slipping the word "System" in there really isn't all that clever. I'll bet somebody could come up with a "5 Essentials System" list that weighs 25 lbs. Oh wait, that's my BOB.
What RAS said. The Sierra Club 10 Essentials are/were:
1. Map
2. Compass
3. Flashlight
4. Sunglasses
5. Extra food and water
6. Extra clothing
7. Waterproof matches
8. Candle
9. Pocketknife
10. First aid kit
Why sunglasses but not a hat or sunscreen? If you carry a flashlight shouldn't you also have extra bulbs and batteries? Why are food and water one item? Wouldn't a Bic be better than waterproof matches? A candle really isn't the best firestarter. And why are matches/candle two items while food/water are one? Why a pocketknife instead of a fixed blade or a multitool?
You see my point. Everyone customizes the 10 essentials according to their needs and preferences. The list isn't written on stone. It's just a tool to get you thinking in terms of navigation, protection from the elements, emergencies, etc.
A lot of people would never leave the house without a GPS, PLB, signal mirror, fishing kit, water purification system, etc. That's all fine and dandy. But if you literally had just the 10 items on the list you'd probably be in pretty good shape.
Kevin B.