Somewhere, in a box unopened for at least a couple of decades, I have a US issue one in its vinyl-like cover. The knock-offs were visually similar, but tended to be looser/wobblier and subject to failure with little effort. If I remember, from the few examples that I've seen, the Canadian issue version was a bit larger. I have a brand-new 64 Pattern cover for the wooden-handled folding shovel, also in a box unopened for at least a couple of decades (no, I am not parting with it). I may also have an 82 Pattern cover, but definitely do not have the shovel itself. There is a little bit of info here: http://www.canadiansoldiers.com/equipment/loadbearing/1982pattern.htm