Thule Shield Pannier (Pair) Material: thermal welded nylon (420D) Volume: [small] 855 cu in, [large] 1464 cu in Dimensions: [small] 12.3 x 10 x 5.5 in, [large] 17 x 13 x 6 in Pockets: interior organizer pockets Compatibility: fits best with Thule racks, but works with most bike racks