Thanks to an expansion zipper that increases the dimensions of the Pack-ItA(R) Reveal Expansion Cube on demand, travelers get two packing cubes in one. The durable compression zipper shrinks bulky garments (or additional clothing purchased while traveling) into a structured parcel that frees up luggage space. And the water-resistant, 100% recycled fabric includes see-through mesh on one side to make items easy to spot.