The closure mechanism on this backpack is a zipper. This backpack is made exclusively from polyester and it has a 29-litre volume.
From Amazon
Wenger PlayerOne notebook case 43.9 cm (17.3") Backpack Black
Conrad Electronic
Wenger Laptop backpack PlayerOne Suitable for up to: 43,9 cm (17,3) Black
This product is also available at 3 unverified stores.