Lone Peak Expandable Mini-Wedge Bicycle Seat Pack 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 material used on top of pack for durability, 3M reflective stripe, rear light hangar Dimensions: 6.5" L x 4.75" W x 4.75" H (non-expanded), 6" H (expanded); Weight 5 oz.