Being with elementary kids - especially when we went on field trips - what I found most helpful was a simple back pack (made out of school themed fabric) filled with various sizes of bandaids, some gauze, (all in zip lock baggies) safety scissors, small hand sanitizer, tissues, a couple of safety pins, masking tape, small pad and a capped pen. If kids needed medicine while we were gone and the school nurse wasn't going, with permission slips from parents and Dr. I could put it in the bag as well. This was also good to carry the emergency information cards on the kids, (and make sure that one was in there for myself as well), along with any emergency #'s that might be needed.