ITW Space Bags travel bags are made of the same durable material that our regular space bags are made of so you can use them over and over again. Because of the clear see through film, you can keep your cloths organized for speedy security checks at airports. Not only can you pack twice as much in your suitcase now, but as you use your travel bags they will keep dirty and damp cloths away from your clean clothes. To use, simply load your travel space bag and starting at the zippered end roll the air out for a tight sealed package. Then add all those items you would not have had room for in your suitcase!!