The bag is a compact backpack with four main exterior compartments plus a quick access Velcro compartment behind the waist panel. Modular (MOLLE) loops on the front, sides and bottom for attaching additional pouches or hangers. The back of the main compartment includes a zippered pocket designed to hold a hydration bag, with a port on top to access the hydration tube. The shoulder straps are fully adjustable from all angles to fit different body types, and there are also chest straps and webbing loops to secure the drinking tube. The back of the bag is designed with a padded mesh lumbar panel for a more comfortable fit on your back for extended periods of time. Inside the main two compartments are smaller mesh panels that are great for organizing your gear and keeping things separate. tactical backpack tactical backpack tactical backpack