Top tube mounted storage for items needing quick access . Splash-proof zipper . Waterproof fabric . Front strap attachment . Anti-Slip base . Can be mounted with Hook and Loop straps or direct top tube mountedThe ATTK S offers easier access than hard-sided top tube boxes through more flexible materials and splash-proof double zipper. Can be mounted with Hook and Loop straps or direct top tube mounted. Front strap attachment keeps the bad snug behind the headset. Waterproof fabric and a splash-proof zipper keeps the contents dry. Item Specifications: Size, 10.4x2.9x1.6`, Bag Size Class, Small (1-100 c.i.), Mount, Velcro Straps/Braze On, Capacity, 23 cu in (.383L), Color, Black, Model Name, ATTK S, Mount, Bolt-on/Strap, Dimensions, 26x7.35x4cm, Weight, 43g,.