Aside from the kit, think about a class. I really enjoyed a Wilderness First Aid class I took a few years ago. Instead of the Red Cross class where the first action is to call 911, they work from the premise that you are a few hours from the trailhead. It is knid of a McGuiver Medicine approach, you would be surprised what you can improvise with.
As for my kits, I have two. The small EDC kit has a clotting gauze packet, aspirin tablets, benadryl, some bandaids, super glue, gauze tape, neosporin ointment, small tweezers (i live in cactus country) and a few alcohol wipes. It is in a small plastic container about 3"x4"x1". It also has matches, a magnesium fire starter, candle nub, nylon string and a whistle. I have black electricians tape, probably 3 ft, wrapped around the outside of it. My larger kit, for backcountry trips or to keep in camp, is from Wilderness Medicine Institute. I added a Epi pen to that kit.
