Wow - those are a great price.
I personally do not have these, so I can not attest to their sturdiness.
What I do have are the black snap photo boxes (not from OT) and they are quite sturdy, more so then the cheapy photo boxes you can pick up at M's or J's for a couple bucks.
The one large snap drawer that fits inside the the cube I would be a little leery about, but the smaller ones would probably be fine.
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