This hiking backpack closes with, among other things, a buckle and lid. One of the materials used to make this bag is polyester and you can put various small items in the inner pocket.
From Amazon
VAUDE Brenta 24 Backpack 20-29L - Blue Sapphire, One Size
Trekkinn
Vaude Tents Brenta 24l Backpack Blue
Hardloop
Vaude Brenta 24 - Hiking backpack Blue Sapphire 24 L