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Do you drink filter/americanos?
I have one of the glass KeepCups, and the seal on the lids only last a few months before allowing leaks through. It doesn't happen if I keep the lid off and allow it to cool down a bit. Most of my use is in the office so it's not the end of the world. But a reusable coffee cup you can't immediately put the lid on and use is a bit shit.
On my second lid (which is leaking) and will likely just get a different cup soon.
The stainless keep cup - I bought one after watcher Hoffman’s reviews of loads fo different cups. I have a frank green but agreed with him that the Drinking hole was a lil small. Keep cup is excellent - but maybe wont keep coffee hot for hours and hours.