The A4SS works well as a tactical weapon-sized scabbard for several Eberlestock packs, including the F4M Terminator, J51 Warhammer, F52 Jackhammer, G1 Little Brother, and J79 Skycrane II. It has semi-rigid sidewalls designed to hold the scabbard open when a pack's load compresses it, making it easier to insert and extract a weapon. The A4SS also works well as a stand-alone product, either as an excellent gun case or as a sniper's drag bag. It can also be used as the foundation for a minimalist pack: add a shoulder harness and a set of our ACST Accessory Straps, and the A4SS becomes a BackScabbard pack, to which you can add an assortment of pockets and build your own modular pack system. It features grasp/carry handles on the middle edges of the scabbard, allowing easy at center-of-gravity carry of a weapon. Includes a GSTC Butt Cover, to allow you to fully enclose a weapon up to 60" long.