You use a zipper to close this bag. This bag is made from nylon and it is targeted towards men.
From Amazon
Osprey Talon 22 Men's Hiking Pack Eclipse Grey - S/M
The product is available from £84.63 at international stores.
Trekkinn
Osprey Talon 22l Backpack Grey S-M
This product is also available at 1 unverified merchant.