I am pretty sure the original intent was to be business card holders, and not actual storage boxes. I have a couple , they are cool, but I do suspect that after time the hinge will not hold up. They also will not hold up if crushed etc. They are not the same material as a Systainer. They look like Systainers, and the latch rotates and holds the lid shut like a T-Loc. But they do not latch to each other. The handle is just molded into the plastic and does not flip up.
None of that means they are not handy for some things besides business cards.
Besides they are just cool [cool]
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Seth