https://www.cutoutandkeep.net/projects/mason-jar-travel-cups • Posted by Alyssa & Carla B.
Drill a hole off-center in the mason jar lid. I tried centering them, but they really look better off-centered. We used a slightly smaller drill bit to make the initial hole, then enlarged it to the 5/16 inch size. We found that we got a cleaner edge that way, but it would still work if you cut only one hole since you’re going to cover it up with a grommet anyway.
Work the rubber grommet into the hole. Don’t be afraid to squeeze it in there!
Add a straw and decorate the jars however you please. Enjoy!