Revelate Designs Shrew Seat Bag. Features: The Shrew is built for big day rides on any terrain Roll down closure allows bag to expand or compress in volume Indie-Rail attachment system provides maximum stability without added hardware Rear strap for added load stability Fiberglass stay Carbon seatpost friendly Made in the USA with domestic and imported materials Third party online sales strictly prohibited by manufacturer Specs: Capacity:137 cu in (2.25L) Color:blue