Our modular backpack system consists of a main compartment constructed with a padded, hollow-core plastic frame that can be oriented either vertically or horizontally. The Extreme version comes with ultra-comfortable straps for long hikes or remote shooting locations. Pair the backpack main compartment and harness with any combination of modular add-ons: 2-pocket front, laptop pocket, battery module, and tripod quiver. Modules sold separately.