Q: Love this! Just ordered one. My ideal would be some way to keep it totally closed when it's not in hand (e.g., in the side bottle pocket of my messenger bag). I'm going to see if one of those "walking sticks" that go in the sip hole fits.
We usually just throw the metal lid that comes with the mason jar under the cuppow, and then put the threaded metal ring on top, tighten, and then toss it in our bags….hasn’t leaked yet!