Functional Design----The day assault backpack is full open zipper like suitcase, convenience for organize and take. Main compartments with laptop compartment, and designed with water bladder access tube on the top, can as hydration backpack. Molle system can attach additional tactical pouches. Multi-Compartments----This 3 day assault backpack designed with 5 two front pockets for small items, two large compartments with built-in mesh pocket and small items separation pocket, and a hidden back compartment, separate compartment to keep all of your gear neatly organized. Heavy Duty Backpack----This military tactical backpack is made of high density 900D oxford fabric that is durable and water resistant, double-stitched, Heavy duty zippers and utility-style cord pulls, Side and front load compression system, all for enhanced performance of the hiking backpack.