I usually buy U-Line double wall packaging boxes for our product. I think I'd give them a try as they're cheaper and better with Prime shipping than the outrageous U-Line shipping prices. And… for me it's U-Line again. The material these boxes are made of is compliant and very similar to U-Line. That's a terrible design. For example, the edges of the flaps aren't parallel and don't even converge! After sealing, there will be a nearly 1/2 inch gap at both the top and bottom. I've never seen such crappy work. It looks like the device used to cut them is either blunt or misaligned. Whatever the reason, I cannot recommend them.
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