Why Bring It? Just in case little Billy falls and hurts himself.
What kind should I get? You can buy a fairly light first-aid kit at most outdoor stores. Or, you can make an even lighter kit at your house. (Note: When you get better, I highly recommend that you buy a backpacking first-aid kit. It's well worth 100 times its weight in gold)
All you need is: A container that will fit: Different sized band-aids, Mole Skin, Gauze Pads, Antiseptic stuff (wipes or Neosporin), Pain relievers such as ADVIL, Adhesive tape, Elastic bandage, Gauze roller bandage, and Latex gloves.