A lightweight, easy to attach saddle bag with Velcro. A great choice for all types of bicycles! - Waterproof construction, welded seams - Adjustable volume - Durable surface material - Large roll-top opening - Front made of Hypalon material which helps protect the saddle post - Reflective details The contact surfaces of Velcro-attached bags may, over long use, wear down the surface of the saddle post and, for example, the rails of the saddle - many people place clear tape or other protection on these points to protect the bike.