Best kombucha brewing jars

Kombucha is the one ferment on this site that wants air. The culture sits on the surface and needs oxygen, which is why a kombucha jar is covered with breathable cloth rather than sealed with an airlock. Get that one thing right and the rest of the vessel decision is straightforward.

The picks above are ordered for a first gallon batch, which is the size nearly every kombucha recipe is written around.

What a brewing vessel has to be

1. Glass. Kombucha is acidic and it sits for a week or more. Glass is inert, easy to sanitize and lets you watch the culture. Avoid metal vessels and anything with a metal interior.
2. Wide-mouthed. A mature SCOBY grows to the width of the vessel, and at some point you will need to lift it out with your hand. A narrow neck turns that into a wrestling match.
3. Breathable at the top. Cloth and a band. Not a lid, not an airlock. This is the opposite of a vegetable ferment and it is the most common beginner mistake we see described.
4. About a gallon. Big enough to be worth the week, small enough to lift and to fit in a cupboard away from direct light.
5. Straight-sided, ideally. A shouldered jar traps the SCOBY below the shoulder as the batch is drawn down.

Spigot or no spigot

A tap near the base turns the jar into a continuous brewer: you draw off finished kombucha and top the jar back up with fresh sweet tea, without lifting anything or disturbing the culture. People who brew steadily tend to end up here.

The costs are real. The spigot is one more part to dismantle and clean, it is the component most likely to leak, and it sits above the sediment line — so the last inch of the jar and the yeast strands that collect there never come out of the tap. Cheap jars sometimes use plastic spigot parts, which are a known weak point; check what yours is made of before buying.

For a first batch, skip it. Find out whether you like kombucha before you buy the plumbing.

Jar, or kit?

A kit bundles the vessel with a culture, tea, sugar and a cover, which solves the real beginner problem: sourcing a live SCOBY. Buying a jar alone means sourcing the culture separately, which is entirely doable and slightly cheaper.

If you have a SCOBY coming from a friend, buy the jar. If you do not, a kit is usually the simpler first purchase — we compare them in best kombucha starter kits, and what the culture actually is, in what is a SCOBY.

Where to keep it

Out of direct sunlight, somewhere reasonably warm, and somewhere you will walk past. Kombucha does not need a cupboard so much as it needs not to be forgotten; the first ferment is judged by taste, so the jar should be somewhere you will actually taste it.

It also should not sit directly beside a vegetable ferment or a bread starter. Cross-contamination between cultures is not a certainty, but separating them costs nothing.