Lone Peak Deluxe Expandable Bicycle Seat Bag Made in the USA since 1979, Lone Peak uses super-durable, water resistant 1000 D Textured Nylon Unzip lower zipper to expand large main compartment for more capacity 3 attachment points and internal polyethylene stiffener for durability and ruggedness Coverlight truck tarp used on top and bottom of pack for ultimate in abrasion and water resistance Dimensions: 7"L x 5W x 4.75 H (non-expanded) or 7"H (expanded); Weight 6 oz.