You close this backpack with a zipper. The material of choice for this bag is polyester and it has a practical inner pocket for smaller items.
From Technoworld PLC
Targus Carry Case Black Nylon Koskin for XL Backpak - TCB001EU
ShopBetter24
Laptop Backpack Targus TCB001EU ATMOSPHERE 18"
This product is also available at 3 unverified merchants.