Using these packing cubes is a breeze. First, sort your travel essentials like clothes, toiletries, or accessories. Then, place them into the appropriate cube based on size. The small cube is great for socks, underwear, or small toiletries, while the medium cube can hold shirts, pants, or larger items. To close the cubes, simply zip them up. When it comes to packing, slide these cubes easily into your Travel Cloud Bag or Cloud Carry - On. For maintenance, you can machine - wash them, but use a gentle cycle. Avoid using harsh detergents that could damage the recycled ripstop nylon material. Also, make sure to zip the cubes up before washing to prevent any damage to the zipper. After washing, let them air - dry to keep their shape.