Our seal end auto bottom boxes ship flat and reshape when stretched. The automatic bottom returns to its original position and structure. Tuck end flaps on top close with double-sided sealing adhesive. An auto-lock base opens effortlessly for quick, secure assembly. Bottom flaps stick together, giving the box a more secure structure.A self-lock feature acts like an adhesive for extra strength. Each box is sealed at one end to protect its contents. This structure folds flat for storage and restores easily when opened.