I'm klutzy and expect to fall!

I bring two large gauze pads, two large "sport" bandaids, roll of waterproof tape, anti-bacterial cream, Tylenol, Benadryl, all in a ziplock bag. Use water from a water bottle to clean off.

I've only needed it twice, but it was great to have. The most recent time was a bike buddy doing an endo (braking, turning, hit a small pothole, up over the handlebars! ) and scraping his forearms and palms before we got riding. He opted to bandage himself up and head out for the 30 miles. I'm not sure I wouldn't have bailed at that point.