Oh, blegh. My kids would carry it for about 15 minutes and at the first ride, they'd hand it to me. No thanks! Besides, they'd want to load them up with too much and it would just be trouble.
For our next trip, I've got a shopping bag thing that has wheels. It can be pulled along behind me. I think it'll fit water, snacks, wipes, Pal Mickey, maybe a jacket or two, cameras, - everything in one thing. Won't matter if it is a little heavy, I'm not carrying it on my back or shoulder. It's made of a tapestry type material and the pattern is almost a dead ringer for the animal kingdom logo. Found it at an airport shop for $5. Probably not great for rougher rides, but my FIL will be able to keep it for that.