I routinely carry and aids in my wallet. Routinely I use them up dealing with micro emergencies when a fellow worker gets an owwie. It is much faster and more effective than opening the office FAK, with its usual assortment of junk.

In my right rear pocket I carry a cotton bandanna for more copious blood letting. I also now toss in a couple of nitrile gloves, ever since the last office incident. It turned out the fellow worker I treated was on illegal drugs. Gotta be careful....