Such the Spot: Designed to fit perfectly on IKEA’s Rajtan spice jars, these white, circular labels will work on most other jars as well. Anderson + Grant: Simple, classic white square labels.

Here's the idea: Cover paper labels with transparent waterproof tape and stick them to your mason jars. Yup, that's it. And, since these labels are waterproof, they don't just work on mason jars.