Clear, plastic compressor bags for travel create up to 75% more packing space by eliminating the extra air that gathers in your garments. Packmate clear plastic compressor bags for travel create up to 75% more packing space by eliminating the extra air that gathers in your garments Simply place your clothing inside these plastic travel compression bags seal the end roll them up and youre ready to go! The air inside the bag with your garments is squeezed out a one-way valve at the opposite end. Bags are made with a heavy triple-laminated nylon/plastic film which is sealed at the edges with heavy duty edge seams. Also includes an improved anti-blowback zipper. Plastic ziplock compression bag makes a handy laundry bag. Waterproof and odorproof. Sizes: Medium - 19.5 x 14" will hold 2 sweaters or 3 days laundry, Large - 27.5" x 18" will hold 3 sweaters or a ski parka or a weeks laundry, and the Multi-Pack includes 1 Medium and 2 larges.