The aerodynamic wedge shape lets these under seat bags slip easily through the wind while the internal pockets keep tools away from inner tubes and other delicate items.Medium: 7.5" x 3.7" x 3.9"Large: 9.1" x 5.1" x 5.5"1000-denier Cordura PlusFitting for taillightWeather resistant, covered zippers keep contents dry3M reflective strip for increased nighttime visibilityItem SpecificationsColorBlackTotal Volume60-80in3Weight130gDimensions7.9 x 4.3 x 4.7"Defined ColorBlack Topeak Aero Wedge Bags Seat Bag UPC: 768661114497