The closure mechanism on this backpack is a zipper. The material of choice for this bag is nylon and you can put various small items in the inner pocket.
From The North Face
The North Face Router Backpack Tnf Black-tnf Black One Size
The product is available from £118.83 at international stores.
JD Sports
The North Face ROUTER - Black - One Size
Physio Room
The North Face Router Backpack - TNF Black/TNF Black - One Size