Rifles. Long, heavy guns, often with detachable magazines housing anywhere from 4 to 30 rounds. Rifles fire high-velocity projectiles capable of accurately striking distant targets - and even a complete novice should be able to hit targets 25-50 yards away. With plenty of practice (and expensive optics), some rifles allow reliable hits at 1,000 yards or so.
Your emergency medicine book will go into more details about setting bones, applying splints, or even doing field amputations with a knife and a saw. But even just to deal with a sprained ankle, a folding cane ($14) may be good to have somewhere in your stash. Beyond that, bandages are useful for improvising splints; in areas where improvisation may be difficult - say, in the desert or up in the mountains - portable folding splints ($10) can be handy, too.
TREE SACKS ARE LIGHT WEIGHT, EASILY PACKED, AND PROVIDE COMFORT WHEREVER YOU ARE! The Tree Sack is just 15.75 oz. with lots of room for a single at 9ft long by 4½ ft wide. The Tree Sack Double is just 25 oz. and has all the space you need being 10ft long by 6½ ft wide. The Tree Sack holding bag allows you to stuff the entire hammock, straps, and carabiner into one small unit. This makes carrying or packing the Tree Sack in your backpack a breeze!