The Gallon Glass Jar 2PK comes with two Glass Jars, two airtight plastic lids, two rubber bands, and two 12"x12" muslin cloths. Just add the ingredients and you are ready to brew, ferment, store, or decorate whatever your heart desires! <p>Whether you are making kombucha, sun tea, milk or other types of kefir, or storing dry foods, our jar has your back. The seal on the inside of the lid helps preserve what you have put inside. If you are brewing, you can use the muslin cloth to keep bugs and debris out of the jar, while you let the solution breathe.