Mason jar "sippies", as I like to call them, are not only functional but very attractive, as well as inexpensive and easy to make.
Here's what you need:
-16oz Ball Mason Jars with lid & ring
-rubber grommets (these can be found at your local hardware store)
-piece of wood
-screwdriver or something to maneuver the grommet in
Before drilling measure the size of the grommet you are using on the bit as they do come in different sizes.
The step bit is nice to ensure you don't make the punch too large!
I have a set at home, a set in the camper, even a set made of the plastic Ball jars for the littles! They also make adorable gifts...
Fill with your favorite beverage and enjoy.