Reusable lid turns jar into coffee mug

Mom was a nurse in the late 60’s, early 70’s and talks about the number of buttocks she had to stitch thanks to dumbasses sticking glass flasks in their back pocket then sitting on them.
I guess nurses 40 years from now will talk of all the palms they had to stitch from dumbasses falling off their fixies with sippable mason jars firmly clutched.

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