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When you find your saddle bag zipper is straining to shut on nearly every ride it might be time to invest in a bigger bag. Castellis Undersaddle XL Bag will hold all of your essentials -- plus the extras you cant leave home without -- but wont add undue bulk to your frame. Made with water and stain-resistant materials and a water-resistant zipper, the bag has Castellis expected combination of sleekness and style. The bags storage features are rounded off with an internal storage pocket and external mini-pump sleeve. It attaches to your frame quickly and securely with a hook-and-loop strap, and even has reflective accents to help keep you visible to motorists, day or night.