If you want to preserve fresh mint, the best way is to wrap it in a damp paper towel and store it in a zip-top plastic bag. Begin by running a sheet of paper towel under cool water and thoroughly wringing out any excess moisture. Once done, you can wrap your bunch of mint in the damp paper towel and then place it inside an appropriately sized zip-top plastic bag. This will ensure your fresh mint stays as good as new for longer!