The Bankers Box Liberty Plus is an OEM letter-size storage box designed for heavy-duty quality, strength, and security. Ideal for stacking without shelving, it features a 3" dustproof seal that ensures a flat box top for improved stability while stacking. The FastFold One Step Setup allows for quick and easy assembly, while the string-and-button closure keeps your letter-size documents secure, even if the box is overturned. Built for heavy daily usage, this box can support a maximum stacking weight of 750 lb.