Lid leaks

Bought this cup to assist my husband with a liquid diet following jaw surgery. The cup is great except for one fatal flaw - the lid leaks. It is not apparent right away, but after a few days of use, we realized that liquids were oozing around the rim of the cup and out from beneath the lid. We only hand washed the cup and lid - never put in the dishwasher. If not for the leaking issue, it would have been almost perfect. The only other flaw is the vent hole in the lid should be a tiny bit larger, but that could be easily remedied.

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