A Removable Storage system provides two classes of media pools: system and application. System media pools include free media pools, unrecognized media pools, and import media pools. Removable Storage creates one free, one unrecognized, and one import media pool for each media type in your Removable Storage system.
For obvious reasons a camera is really nice to bring along. Big plus if it's a digital camera! Other items: a whistle, in case you get lost or need help ; waterproof matches ; some kind of lip balm/blistex ; sunglasses ; extra batteries for that flashlight! gaiters are great if you're hiking in shorts and it's a bushy or wet trail
If you hike often, a canister can be a worthwhile purchase. They can also often be rented on popular hiking routes if you don't want to buy your own. Place all food into the canister and close completely. Locate your sleeping area away from your cooking and bear canister area, ideally at least 100 yards.