【Durable and Waterproof Tactical Backpack】The tactical bag features an ultra-strong shell fabric, made of nylon fabric for long-lasting performance. The shell is durable and water-resistant, stitched with reinforced nylon thread. 【Expandable Tactical Backpack Size】21" x 15" x 9". Fully extended. Capacity: 39-64 liters. The foldable and expandable design allows you to adjust the size of the pack to fit your gear. 【Military Backpack with MOLLE System】MOLLE backpack. Features 4" x 4" patch panels on the front and back for attaching name patches and morale patches. Thick MOLLE loops and webbing allow for attaching additional tactical pouches and gear. 3-day assault pack backpack combat molle backpack. 【Heavy-Duty Backpack with Multiple Compartments】: The military backpack has 3 main multi-compartments and dual zipper closure pockets. There are more storage options, including internal zippered pockets and mesh pockets. The main area expands from 5 inches to 10 inches to fit more gear. Each compartment has mesh or zippered pockets for storing gear. This heavy-duty backpack has a compartment for a laptop. 【Travel Backpack】The military backpack is hydration compatible and is perfect as a hydration pack (hydration bladder not included). It can be used daily as a 3-day assault pack, gym backpack, bug out bag backpack, range bag, survival backpack, army backpack, MOLLE backpack, men's backpack, hunting backpack, outdoor camping backpack, travel backpack, or daypack.