Durable compression zipper eliminates excess air between clothes to maximize packing space Semitransparent fabric to see what is inside while still keeping belongings discreet Compatible with all sizes and brands of luggage (most carry-on luggage fits 4 small cubes or 2 small cubes with 1 medium cube) Ideal for underwear, socks and t-shirts (we recommend rolling your items to save space and minimize wrinkling) Durable, bluesign approved 100D ripstop nylon material that minimizes impact on the environment, is water-repellent and will withstand years of use Thule packing cube white NWT Medium size