Lids started cracking, boxes changed shape after washing in dishwasher.

I bought 3 of these boxes for my toddler to pack lunch for daycare. For the first 2 weeks it worked great, but after that all the lids started with a crack, now few of them are broken. Also the boxes have changed shape after putting them in top rack dishwashing for 2-3 weeks. It didn't work for us at all, waste of money.

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