RV, yeah, the original "lunch pails" were indeed pails (Daddy and my older uncles described generally the size and shape of a one gallon paint can) They were used by pretty much everybody who carried lunch to work (miners, factory workers, construction workers, even farmers) from the late 19th century until the spread of commercial lunch boxes in the 1920s. The modern Aladdin one Jared linked is steel and the same design (by whatever makers) that replaced the original pails from the early 1920s until plastics replaced it in the 1960s. Each half (top and bottom) is pressed from a single sheet of steel and spot welded at the end seams. I looked up the Sudbury one you referenced and it looks sturdy enough as well. Mind, neither of them is insulated.