Large capacity seat bag specially designed for bikepackers providing a streamlined way to carry gear without the need for a rear rack Constructed of lightweight, durable, and water resistant material Upgraded saddle mount system reduces the pendulum effect of carrying large rear payloads, providing a comfortable, controllable ride for extended expeditions Integrated air release button keeps the inner waterproof bag compact Velcro Straps 19.7x6.3x5.9` 366 c.i. Black X-Large (301-500 c.i.)UPC/EAN/GTIN: 883466012080