Revelate Designs Stoat Seat Bag. Features: The waterproof Stoat securely carries your tools, tubes, and spares without any zippers or velcro to get gritty and gummed up The Stoat transforms into a stable on-frame storage bag that can be placed anywhere simply by reversing the direction of the attachment strap Dropper post compatible Waterproof, no zippers or velcro Welded construction and features a built in Voile urethane strap for easy mounting and solid compression Padded with high density foam to provide structure and prevent rattling Third party online sales strictly prohibited by manufacturer Specs: Model:Stoat Mount:strap Capacity:49 cu in (0.8L) Color:black Weight:99g