Very thin boxes, to say the least, I'm not thrilled. I always ignore the negative reviews about things like this because I think people are too picky about how much I regret this time. I had to double them to get closer to the thickness of the boxes I normally use and even then the sides sagged too easily for my comfort. The description says the coffee mug can be mailed but I really hope your coffee mug is concrete as anything smaller will arrive unassembled. They do not work in any email application. The only benefit I could see for them would be if you put something in that box, then wrap it in extra packing material and put it in a real box.
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