Came across USNERDOC's YouTube channel over the weekend and have been scoping out some of his videos. Pretty informative. He's a medical professional by-day and has some excellent and thorough videos on medical/first aid kits. Check out the below on his "Level 1" or individual first aid kit; he provides links to vendors and a comprehensive PDF item list on the YouTube page.
First Aid info like this is often hard to come by, so watch and learn!