Using the most durable material possible, D1000 Cordura, the team builds rucks that utilize the best aspects of the rucks issued by the US Army Special Forces. Brick Bag, while named for its ability to house the bricks used during a GORUCK Challenge, is versatile enough for any adventure. Use it as a stuff sack to segregate gym clothes, a compression sack for your sleeping bag, or wrap your liquid bricks in Brick Bag to safely house your beer cans. Tip: Use the compression straps when Hiking With GR2 and Brick Bag Attached or whenever space is at a premium. The compression straps on Brick Bag are specially designed to attach to the exterior of GR2.