Guardian Storage Box is a long-term storage container that is proven to protect your items from fire, water and other environmental damage. Designed to protect your important business documents, it can hold both letter-size and legal-size paper. The secure lid locks in place with two latches to keep out debris. Boxes are also stackable up to three high to provide a convenient storage solution even when space is limited. Storage box offers ETL verified 20-minute fire protection and is ETL verified water spray-resistant.