The Container Store, Staples and Really Useful Boxes sell extra large storage cardboard and plastic boxes that hold up to 31 gallons. Homedepot.com also sells large boxes, including some suitable for outdoor use to store garden furniture. SmartBox offers extremely large portable storage boxes that hold up to 3,000 pounds.
The Container Store's inventory of storage boxes includes garage totes, watertight trunks and trunks with wheels. Staples' inventory includes various moving boxes that close securely without tape, a wardrobe box complete with hanging rail, and a large corrugated fiberboard box. Really Useful Boxes has plastic boxes that hold nearly 32 gallons.