The Topeak Aero Wedge Pack DX SaddleBag has an aerodynamic wedge shape that lets these under seat bags slip easily through the wind while the internal pockets keep tools away from inner tubes and other delicate items. A 3M™ reflective strip has been added for extra visibility.Topeak Aero Wedge Pack DX SaddleBag FeaturesAdded Features: 3M™ reflective strip, Safety light clip (3M™ is a registered trademark of 3M Company).Bag Attachment: QuickClick® (F25) w/ seatpost strapCapacity: 0.45 L / 28 ci (Small), 0.54 L / 33 ci (Medium)Material: 1000 denier nylonSeatpost Diameter: Fits 27.2 - 34.9 mmSize: 16 x 8.5 x 8.5 cm / 6.3” x 3.3” x 3.3” (Small), 19 x 10 x 9.5 cm / 7.5” x 3.9” x 3.7” (Medium)Weight: 125 g / 4.40 oz (Small), 150 g / 5.28 oz (Medium)