Looking for a new backpack? This might be the thing for you. It is made from several materials, including polyamide, and things you want to keep extra track of can go in the inner pocket.
From Amazon
Vaude 14525 Unisex Adults’ Backpacks 15-19L, Black, 22 Liters
Hardloop
Vaude Moab Pro 22 II - Cycling backpack Black 22 L