In my humble opinion all you need is something to stop major bleeding, for that I carry a sanitary napkin and duct tape. In addition a major prescription pain killer and some neosporin. The rest is not necessary because if something happens you hike or crawl your ass to civilization. I don't believe in aspirin or motrin because pain is important to feel. I tells you that you are going too hard. I am not young but I have no trouble hiking long miles without pain. Taking pain killers and antibiotics for small things causes that problem to persist becase you are mistreating the original problem by hiking miles you are not ready for. I also believe in Probiotics, prior to a long hike. These are foods like yogert (I know, yuk) that have microorganisims that feed the good bacteria in your stomach. When they are healthy you can easily fight off gardia (not that you shouldn't treat your water). A fit healthy body can take anything but a bad fall.