Saddle Bag/Bike Bag | Straps to Your Seat with EASE | MEDIUM Size Bicycle Pouch with 2 Straps to Carry All Your Important Biking Accessories GREAT DESIGN: - The aerodynamic wedge shape lets this under bike seat bag slip easily through the wind. Proprietary quick-release mounting system allows fast and easy tool-free mounting and removal of equipped bags, tools, lights and accessories. ATTACHES EASILY TO ANY BIKE: - Velcro seat post attachment and over-the-rail straps let you affix it to your bike in moments. Just unclick the buckle and the Velcro, and its easy to take with you indoors. EASY ACCESS TO YOUR ESSENTIALS: - Wide, full-zip mouth opening enables easy access to your valuables. Large main opening offers room for essential road gear. Reflective strip and rear light attachment offer safety-minded touches. Also EXPANDABLE for added capacity. CONVENIENT SIZE:  7 inch length x 4 inch width x 4.5 depth. Zippered compartment expands to 7.5 depth for added storage. Capacity: 0.7 - 1.0 L. Weight: 4 oz. VERY DURABLE: - Constructed of rugged, 600-denier nylon material and stands up to the elements. Machine washable & Machine dryable. 60 DAY WARRANTY: For any quality problems in the next 60 days, we provide free replacement or full refund.