For the GIIM Tactical pack go here: Gunslinger II M Tactical

The G2H backpack was developed from the original GS05M Gunslinger. It has a slightly larger scabbard, to better accommodate weapons with larger cross-sections or bulky optics. The scabbard is wide at the bottom, giving the option of carrying weapons butt-down or butt-up. The main bag is the same size as the GS05M, so capacity is about the same. Like the Operator, it has both front loading and top loading features, giving exceptional accessibility and loading flexibility. The G2 is a great platform to make the ultimate "go bag." It is relatively compact, yet capable of internally storing an M-16/M-4/AR type weapon, water, ammo, and survival gear. Once in the field, the pack has good capacity, but has the added benefit of being really easy to lash additional gear to, simply by cranking on an external load with its built-in compression straps. The top pocket assembly features a handy internal organizer, with several small pockets, pen holders, and a padded pocket which serves equally well for AR mags or for a PDA.

Check out the all new optional Endo Internal Frame Accessory from Eberlestock.  The Endo frame is designed to sit inside the GII Backpack and substantially increases it's ability to carry weight.