This tactical waterproof pack uses durable 900D Oxford waterproof fabric. This backpack’s sizes are 19.6″*11.8″*11.8″ and the capacity is 45L. It has hydration compatible that works great for a hydration bladder (backpack exclude hydration bladder). It also can be used for a daily use bag and a carry on bag for travel, or for hunting, hiking, camping, trekking. This MOLLE webbing allows you to add straps, compartments, and other customized features to your tactical backpack.