It baffles me that some "standard" food metal cans of the 7.5 cm diameter kind, are still made in a way that end up in fact not safely stackable. By safely stackable here I mean, they should lock in place when placing one can on top of another, so that the top one can't slide sideways. I've noticed that at least here in Germany, for example many fruit cans sold in Aldi stores are NOT safely stackable at all. This is such an annoying "feature" that ought to be completely abolished. There is no reason whatsoever to make them non-stackable, is there?