This dry bag from Castelli attaches under your saddle to provide storage for essential tools and accessories. Manufactured from water and stain resistant materials, with a water-resistant zipper to keep your gear protected from the elements. The hook and loop attachment strap is adjustable to fit all saddle sizes. An internal storage pocket keeps your items organized, there is also an external sleeve for a mini pump and reflective accents on the exterior to add visibility in low light environments.