We sponsor a booth at a local outdoor show where attendees can make a pocket first aid kit. As you put it, one to handle the small boo-boos. We supply attendees with 2 gauze pads, 3- (1"x3") bandaids, 2-(2"x3") bandaids, 2-(1-1/2x2") bandaids, 2 antibiotic ointment packets, 2 alcohol pads, and 2 antiseptic wipes. At the end of the line they pick up a small zip-lock bag. You can get zip-lock bags in 2, 4, 6 mil. The thicker the bag the more hardy. I have carried these first aid kits in my briefcase, car, and desk. Pop one in my pocket when I go out trail walking or do the tourist routine (never know when a bandaid will cure someones heel blister). We use 2 mil bags. If I was carrying it in my pocket every day, I would opt for a 4 or 6 mil bag.
You can also use a small tin such as an Altoid box.
By the way, at the last outdoor show we had 400 kits made by the participants.