Description from The Container Store
The Travel Space Bag® packing system is the ultimate companion to the Pack-It® System from Eagle Creek®. They complement each other perfectly! Where the Pack-It® system excels at packing standard garments and keeps them neat and wrinkle-free, the Travel Space Bag® products are the solution for compactly packing and transporting bulky garments like sweaters and knits, and fiber-filled coats, as well as accouterments such as towels and pillows. It also makes perfect sense to take the Travel Space Bags® along completely empty to transport wet or dirty clothes, linens, or towels without making a mess of your other clothes, accessories and luggage. The secret is a one way valve in the end of each bag. Directions on proper folding of the garment are printed on the bag itself so they can’t be lost or forgotten.