Drinking Lid turns mason jars into portable drinking containers.

Providing eco-friendly alternative to disposable hot cups and travel mugs, BPA-free and 100% recyclable Cuppow lids turn wide- or regular-mouth mason jars into portable drinking containers. Regular mouth Cuppow fits regular mouth mason jar and requires

[source: http://news.thomasnet.com/fullstory/Drinking-Lid-turns-mason-jars-into-portable-drinking-containers-20002451]