The BirdBag utility bag is an easy way to mount 1900 cubic inches of additional capacity on your Eberlestock pack. It has a nylon mesh front designed to let meat cool, and a solid nylon back to keep your pack clean, and comes in a mesh stuff sack. When combined with packs with large compression straps, such as the Gunslinger, the BirdBag will carry a significant amount of meat. For packs without external compression straps, such as the X1, the bag is great for lighter loads of meat or upland game. For heavier loads on these packs, Eberlestock recommends adding a cross-lashing of supplemental accessory straps.