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.The DX provides just the right amount of room for an MTB tube, patch kit, and a tool for mountain bike useQuickClick mounting system for convenienceWeather resistant, covered zippers keep contents dry3M reflective strip for increased nighttime visibilitySmall: 6.3" x 3.3" x 3.3"Medium: 7.5" x 3.7" x 3.9"Large: 9.1" x 5.1" x 5.5"1000-denier Cordura PlusFitting for taillightDX bag has an internal packet to keep tools away from delicate itemsItem SpecificationsColorBlackTotal Volume33in3