Cuppow is a a reusable lid that turns a glass canning jar into a travel mug. They have versions for regular and wide mouth glass jars. It's made in the USA from BPA-free, Phthalate-free plastic. What a great idea! Amazon has the regular mouth size for $8; you supply the jar. Cuppow Regular and Cuppow Wide Mouth
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.