You use a zipper to close this bag. Several materials have been used to make this bag, among them nylon, and things you want to keep extra track of can go in the inner pocket.
From The North Face
The North Face Kaban 2.0 Backpack Tnf Black-tnf Black One Size
The product is available from £79.52 at international stores.
JD Sports
The North Face Kaban 2.0 Backpack - Black - OS
This product is also available at 1 unverified merchant.