Our friend James from 10 Engines blog turned us on to this gadget that we would actually use…the Cuppow. It’s a BPA-free insert that turns any canning jar into a travel mug. What we didn’t really think about ’til we looked at the Cuppow site is that canning jars are heat-resistant. Add to that the fact that they’re easy to clean, readily available, cheap, and durable, and you’ve got a serious a-ha moment. Nice work.