This hiking backpack closes with, among other things, a buckle and lid. The material of choice for this bag is nylon and it has a volume of 58 litres.
From Amazon
Osprey Aether Plus 60 Men's Backpacking Backpack
Chain Reaction Cycles
Osprey Aether Plus 60 Backpack SS21, Green
Trekkinn
Osprey Aether Plus 60l Backpack Green S-M