Great idea but not strong enough. I filled the water pouch and blew it up for my six year old son. I (thankfully) told him to keep it on towels as I didn't trust the bung. The bung was fine but one of the seams on the water pouch started leaking in less than 24hrs. I'm undecided if I can be bothered to fix it or not. I probably could, if I tried, but I'd have to use patches from other blow ups as there weren't any with this one.

If you had more I'd collect the lot lol awesome