You close this hiking backpack with a buckle and lid. The material of choice for this bag is nylon and you can put various small items in the inner pocket.
From Amazon
Osprey Aether 65 Men's Backpacking Pack Deep Water Blue - L/XL
GearFreak.uk
Osprey - Aether Men's Hiking Backpack 68L Large / XL Blue
Trekkinn
Osprey Aether 65l Backpack Blue L-XL