Inner HPA Tank Storage compartment with two adjustable velcro straps to securely hold up to an 80 cubic inch HPA air system; Dual HPA air line routes integrated into shoulder straps secure hose in place to prevent kinks, twists and excessive movement; Modular outer storage compartment with laser cut molle webbing can be removed and used in a chest rig style configuration; Lite Chest-Rig pad included; Detachable open-cell padded foam back panel provides comfort against your spine; 19 multi-functional tether points for a wide array of kit configurations; Multiple exterior velcro panel areas allow attachment for patches, mag cells or the included modular outer compartment; Hostile removable velcro patch attached to the outer storage compartment; Laser cut molle webbing; Hydration water bag compartment with metal clip for holding a water bag in place with dedicated water line port; Exterior and interior zipper compartments; Two large main compartments with 180 degree opening for easy packing and loading; Integrated padding zones provide support and comfort throughout your back and shoulders; Heavy duty Impact-resistant materials