Reinforcing element for collapsible container

Claim 1

An improved foldable reinforcing liner for use with a collapsible reusable shipping container comprising: first and second wall elements, each of said wall elements including a side wall and first and second end walls foldably interconnected to said side wall at opposite ends thereof; said end walls, in erected position, being positioned at substantially a right angle relative to a respective side wall; said first end walls of each of said wall elements including first and second mutually foldable portions interconnected by a fold line; said second end walls of each of said wall elements being relatively rigid and being interconnected to a first end wall of the other of said wall elements only over an abutting surface of one of said first and second foldable portions, leaving the remainder of said second end walls free of interconnection and terminating in a free edge; each of said wall elements having a multiply separable member including first, second and third laminae interconnected in mutually staggered relation to define a recess; said remainder of said second end walls forming a tongue which is slidably engageable within a respective recess to effectively increase the length of said second end walls to that of said first end walls when said reinforcing liner is in use, and being removable to permit the collapsing of said liner without interference for storage.