Abstract: A cardboard carton lid is constructed so that the carton may be securely packed and shipped without the necessity for plastic strapping, and using lower strength paperboard than is conventionally provided, yet allow the carton lid to be reused. The lid has elongated side panels with first and second parallel lines of weakness (e.g. perforations) formed in them. The bottom, fastening portion of the side panels is secured--as by adhesive--to the carton body side walls. A blank, and enlarged grasping portion in the carton lid side panels at the lines of weakness allow a user to grasp the strip between the lines of weakness and detach the lid from the securing portions of the side panels. The lid can be reused after detachment. The carton is packed with nondeformable material such as business forms which extend above the top edge of the carton.

Abstract: A carton includes bottom flaps that, upon erection of the carton, fold inwardly and interlock to form a strong lock bottom carton ready for immediate loading without the aid of fastening means. The structure allows the carton to be used as a retripper whereby the bottom flaps are folded inwardly as the carton is collapsed to a flat, shipping state with the relation between the interlocked flaps being such as to allow ready return of the lock bottom condition upon re-erection of the carton.