Round base Nylon Cordura stuffsac with 4 compression cords to minimize pack size when weight matters. Fits up to: 7 L (SM), 10 L (MD), 15 L (LG), 20 L (XL). Size: 6.7" x 11.8" (SM), 7.5" x 13.8" (MD), 8.7" x 15.7" (LG), 9.4" x 17.7" (XL). Wt: 2.5 oz. (MD).