Thank you to
I don't have an actual suggestion, but something to think about. Pick a backpack with as few zipper areas as possible. A lot of the new backpacks have over 5 compartments, and even when you don't even use the compartments, for the bag check, you have to unzip every single one. It's a major pain.
I use a Nike "Gym Sack" Extremely light weight and just large enough to put everything you need.
We've tried a few things.
Regular backpack - 1 big pocket & 1 small outside pocket. Not so much support, but easy for security (especially w/ ziploc bags) & will hold just what you need and not much