Made of high-quality ultra light-weight NYLON and Zippers; no matter how you pack it your cubes will go to the distance; NO broken zippers, NO weak stitching.Mesh top panel for easy identification of contents. Double zipper pulls make opening/closing simple and fast. Webbing handle makes carrying the cube by itself convenient.You can expect more than 35% compression. Take 1 cube with you as a carry-on item to reduce weight on checked-in luggage. THIS ITEM IS NOT INTENDED FOR USE BY CHILDREN 12 AND UNDER.These cubes are designed to fit like a glove into most airline carry-on and checked suitcases, tote bags, weekender, backpacks and duffel bags. The medium size is EXTREMELY POPULAR - it makes planning your wardrobe so easy. Simply visualize what you'll be wearing, then pack outfit by outfit. This system ensures you will NEVER forget stuff at home again!