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@CYOA
To add to the above sentiments - I've tried MANY cups and none are leak proof. The closest match I've found that will not leak* is a tiny flask. 12oz was the smallest I found (klean kanteen) that met my criteria and it's been a great buy. I already have some of their water bottles and their insulated flask lives up to my hopes. Use it every day.
*make sure you have an extra sip AFTER you've closed the seal as some coffee pools in the lid when you open/swig. So if you sip/close/put away you might find a teaspoon full or so has spilt unless you do a safety sip.