Abstract: A knock-down, collapsible drum container assembly, comprising a pair of polygonal tubular members one adapted to fit within the other and comprising outer and inner tubular members of said container, each of said members being collapsible to a substantially flat state along oppositely disposed axially extending score lines thereof, end closures for said tubular members comprising pairs of inner and outer closure caps, said inner closure caps being configured to fit within said outer tubular member at the opposite ends thereof and having integral therewith radially extending flaps bendable along score lines to bear against the inner wall of said outer tubular member, said inner tubular member being configured to fit within and bear against said flaps as so disposed, said outer closure caps being configured to span the ends of said outer tubular member and having integral therewith radially extending flaps bendable along score lines into engagement with the outer wall of said outer tubular member, whereby said