The Osprey Backpack Expansion Pack is a rare and possibly discontinued item designed to increase the capacity of Osprey backpacks. Made of durable nylon with a zip closure, this accessory pack in a green color offers additional storage with two pockets and a frame material of nylon. Weighing 11 oz and measuring 15” in height, this item from the United States is ideal for backpacking and outdoor activities, providing easy attachment to backpacks for added convenience.