Maxpedition Falcon-II Backpack, Dark Brown Overall size: 9"(L) x 10"(W) x 18"(H) Main compartment: 9"(L) x 4"(W) x 18"(H) Secondary compartment: 8"(L) x 3"(W) x 16"(H) Volume: 1400 cu.in. / 23L One (1) 8.5"(L) x 17"(H) zippered compartment with internal loop field accommodates CCW or 100oz/3L water reservoir