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.QuickClick mounting system for convenienceMedium: 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 Volume90-120in3Weight176gDimensions8.3 x 4.9 x 5.5"Defined ColorBlack Topeak Aero Wedge Bags Seat Bag UPC: 768661113889