A new idea in wedge pack construction combines molded side panels with flexible 600 denier fabric to form semi rigid, weather resistant saddle bag. A large, side-opening panel gives easy access to all your under saddle gear. Internal mesh pockets keep keys and small tools in place while riding. QuickClick™ compatible for fast, easy transfer between bikes.Material600 Denier & EVA Foam.Added Features3M™ Reflective Strip (* 3M™ is a registered trademark of 3M Company.),Safety Light Clip,QuickClick™ w/ Seatpost Strap (F25).SmallCapacity0.5 L / 30 ci.Size (L x W x H)14 x 11 x 9.5 cm,5.5” x 4.3” x 3.7”.Weight110 g / 3.87 oz.MediumCapacity0.7 L / 42 ci.Seatpost DiameterFits ø25.4 - ø34.9 mm.Size (L x W x H)18 x 11 x 11.5 cm,7.1” x 4.3” x 4.5”.Weight190 g / 6.69 oz .