First aid and repair gear depends on the length of your trip and your first aid training. I take a minimal first aid kit because I am not a medically trained person. My first aid kit is much like Jim's + moleskin. I do not take a repair kit for a 2-3 day trip. For a 10 day trip I take a needle, use dental floss if needed, a few safety pins, a little duct tape, one patch for nylon. I do not take extra cord- if I need some, I take it off my tent or off my bear-hanging string. My pack strap broke on one trip and I used my tent cord for that. A jacket zipper broke- sewed bottom up with dental floss and made it an anorak. Sometimes my first aid tape gets used for repairs. I do not take any special tools. If I use my Kelty external frame, I take a few extra clevis pins and rings. Shoes are very critical- I make sure my shoes are in good shape when I start a long trip. My sleeping pad was severely punctured once- I just put up with sleeping on hard cold ground. When things go wrong, I usually improvise.

I have been on trips where there were pretty significant injuries. Do not assume it cannot happen. You need to stop bleeding and treat for shock. There is not a whole lot more that can be done. But realize that minor injuries, on a long trip, can grow into major disabilitating injuries - infected cut, severe blisters, burns, sunburn that blisters. In fact on long trips (30+ days) your hands can get so cracked that you can hardly use them so you need to take lanoline or some other good hand cream. Some people take some stuff that you can put in a tooth if you crack or break a filling. And my first aid kit contains some pretty powerful pain medicine and antihistamin. Ace bandage has been used many times. A good first aid kit does not have to weigh a lot- half a pound or less.