Pack up to three times more in suitcases and carry-ons with our ingenious 3-Piece Traveler compression bag set. Just place garments inside... zip bag closed... then roll or press using our patented one-way valve to dramatically compress contents. You’ll save space, time and extra luggage charges. Also increases the capacity of your carry-on and backpack. Made from polyethylene and nylon lamination that is airtight, waterproof and reusable. Set of three—one large 19½" x 28" bag and two medium 19" x 20" bags.