Believe me, I'm very well practiced, and I have twin 15 year old girls also. I'll be an expert by the time they're in college.

And the Knog bags are really nice. If they would have fixed the small problems they'd be great bags. I'm surprised they didn't catch on. Everybody that sees mine is very impressed with it. It looks like they've given up on selling them and all that remain are the leftovers.

To fix the flopping, I put a bungee cord into the loops for the waist strap which I took off and never used. That works pretty well, and it would have been great if it came with that instead of the waist strap.