The tumblers look great at first, and the seal is excellent, but the tumblers are VERY prone to crack. Out of 6 purchased to make gifts, 4 of the 6 were cracked before we even were able to print the inserts. They didn't come cracked, but they can't stand even the slightest bump without massive cracks on the side, or cracks along the top of the lid, which breaks the waterproof seal.
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