Stackable storage box glides across most surfaces easily so it's easy to put into storage and retrieve. Modular lid makes the file box easy to stack. Low-friction disks on the bottom make it easy to move in and out of storage spaces on a variety of indoor surfaces without adding height to the product. Durable design accommodates various items and slides easily under most beds and other low-clearance furniture. Clear exterior makes the contents easily identifiable. Storage box also features snap-tight buckles for secure storage and holds 40 quarts or 10 gallons.