Eberlestock Accessories, SuperSpike Duffel Super Spike increases your pack's capacity by a full 2900 cubic inches - made for use with Eberlestock J-series packs and the F1 Mainframe Made of the same NT1 fabric that our hunting packs are made of, so that when mounted externally you get both added capacity and greater camouflage coverage Features external facing access, internal tuck-pockets, and a carry strap, making it useful not just in camp, but anytime you need a nice sized duffel bag Can be carried either internally or externally on your J-series pack Dimensions: 22"h x 13"w x 11.5"d; weight: 1 lb 8 oz