Fermentaholics Unbleached Muslin Kombucha Covers - 4 Pack with Rubber Bands - 10" Square Fits Wide Variety Of Jar Openings - Tight Weave Keeps Flies Out - Let's Your Kombucha Breathe - Hand Wash

These work well, covering jars during fermentation

High quality, tight weave, fruit flies won’t get in.

I was looking for a cover for my 1.4 gallon Little mouth bubbler jar I use for Kombucha.The covers fit perfect and the edges are hemmed.The only negative is the rubber bands, since the opening of my jar is 6" not sure how long the rubber bands will last before they break, but rubber bands are cheap!Great product I would buy again.Greg

Nice squares of muslin I use to cover my 2.5 gallon kombucha container. They allow good airflow in & out of the brew & completely keep fruit flies out. Also nice they include rubber bands.My only gripe would be the edges not being finished which allows fraying. But it's not a deal breaker. Guess if they were finished they'd be more expensive than they are. ¯\_(ツ)_/¯Unbleached Muslin Kombucha Covers - 4 Pack with Rubber Bands - 10" Square Fits Wide Variety Of Jar Openings - Tight Weave Keeps Flies Out - Let's Your Kombucha Breathe - Hand Wash

Good quality. A little expensive.

They are great for other things I need. Love them.

I used cheesecloth for my first scoby and had to discard it when fruit flies got in anyway. This seems like a much better fabric to use.

Brewed my first batch of kombucha and these worked well for me!