SHREWD S-PACK STABILIZER BAG BLACK DOUBLE 37/20 IN. The Double S-Pack has a 37” long and 20” long pocket to hold stabilizers in place, as well as a 6” pocket for additional weights and smaller accessories. The Double S-Pack is designed for someone with a single front and rear stabilizer for safe transport to and from your location. The back of the Double S-Pack has four loops of webbing that allow a second S-Pack to be attached using clips (sold separately).