Organize socks, toiletries, belts etc. Pack them in the 4 individual packing cubes and they are easy to pull out and put in draws. Save time and keep similar items together. Keep items separate from the rest of your case. They are designed to match the 15 pocket duffels but can easily be used for any luggage, duffels etc. Uniquely colored for quick identification. Each piece has front and back see through waterproof PVC mesh, and easy access zipper opening. They are water resistant. Each set of four packing cubes contains two different sizes.