Bottling & carbonation
Sixteen ounces is one serving. Everything larger is a bet that you will finish it before it goes flat.
By Scooter M.·Published September 1, 2026
The short answer
Sixteen ounces for almost everyone. It is one serving, so a bottle gets opened once and finished, which is the whole game — carbonation starts leaving the moment a bottle is opened and never comes back. Larger bottles halve the bottling work and cost you fizz.
| Bottle size | Bottles per gallon | Bottles per 2 gallons |
|---|---|---|
| 12 oz | 9-10 | 19 |
| 16 oz | 7 | 14 |
| 22 oz | 5 | 10 |
| 32 oz | 3.5 | 7 |
| 1 liter (33.75 oz) | 3.4 | 6-7 |
Seven bottles is roughly twenty minutes of filling, capping and wiping. Three and a half is closer to ten. That is the entire practical case for going bigger, and it is a real one — bottling is the least enjoyable part of the whole process.
Carbonation is dissolved gas, and it is in equilibrium with the pressure above the liquid. Open a bottle and that pressure goes to atmospheric; the gas starts coming out of solution and does not go back in. Reclosing the swing top slows the loss. It does not reverse it.
So a 32 oz bottle opened on Monday is noticeably flatter on Tuesday and largely flat by Wednesday. If your household drinks a quart at a sitting, that is irrelevant. If one person is having a glass with dinner, a 16 oz bottle finished in one go tastes better than the second half of a quart.
Size interacts with the pressure question in a way that is easy to miss. EZ Cap publishes a 100 PSI rating for its 16 oz amber bottle. It does not publish one for the 32 oz in the same line, and we do not carry the figure across — a larger bottle presents more glass area at the same internal pressure, and the maker chose not to make the claim.
There is also the practical dimension: an over-carbonated quart makes a considerably bigger mess than an over-carbonated pint, and is more startling to open. Swing-top bottles covers what to look for.
Sixteen ounces for conditioning and serving, thirty-two for a household that drinks a quart at a time, and a liter for storing what is already finished.
EZ Cap
The only bottle here with a published pressure rating — 100 PSI — in amber glass, which is the combination a second ferment actually asks for.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
EZ Cap
The same swing top and amber glass at quart size, which turns a gallon batch into six bottles instead of ten and roughly halves the bottling job.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Bormioli Rocco
Italian soda-lime glass with a published height and diameter and a hermetic clamp seal — the bottle that looks like a bottle, with the dimensions to check it fits a fridge door.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Seven 16 oz bottles need a shelf. Two-thirds of a gallon in liter bottles needs a different shelf, and a liter bottle at 12.13 in tall — Bormioli Rocco publishes that figure, along with its 3.5 in diameter — will not stand upright in many fridge doors.
This is one of very few categories where dimensions are genuinely published. IKEA gives the KORKEN as 29 cm tall and 9 cm in diameter. Measure the shelf before you order twelve bottles; it is a five-minute check that avoids a returns problem.
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Ranked on the published rubric. Every row jumps to that product's full write-up below; the button goes straight to Amazon.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | Score8.3 EZ Cap Swing Top Bottles, Amber Glass, 16 oz (Case of 12) The only bottle here with a published pressure rating — 100 PSI — in amber glass, which is the combination a second ferment actually asks for. | Second ferment, one serving at a time | 8.3out of 10 | |
| 2 | Score7.8 EZ Cap Swing Top Bottles, Amber Glass, 32 oz (Case of 12) The same swing top and amber glass at quart size, which turns a gallon batch into six bottles instead of ten and roughly halves the bottling job. | Bottling a gallon in six moves | 7.8out of 10 | |
| 3 | Score8.0 Bormioli Rocco Swing Top Bottle, 33.75 oz (1 L) Italian soda-lime glass with a published height and diameter and a hermetic clamp seal — the bottle that looks like a bottle, with the dimensions to check it fits a fridge door. | A bottle you would put on a table | 8.0out of 10 | |
| 4 | Score8.1 IKEA KORKEN Bottle with Stopper, 1 L (34 oz) A cheap, well-dimensioned liter bottle with a clamp stopper and a published dishwasher limit — good storage, and explicitly the wrong tool for building pressure. | Storing finished kombucha, not carbonating it | 8.1out of 10 |
#1 · Second ferment, one serving at a time
The only bottle here with a published pressure rating — 100 PSI — in amber glass, which is the combination a second ferment actually asks for.
Who it is for. Anyone doing a second ferment who wants a bottle with a number behind it rather than a shape that looks strong.
Source: MoreBeer published EZ Cap product specification (capacity, pressure rating, case contents, crown cap compatibility), morebeer.com/products/ez-cap-swing-top-bottles-amber-glass-16-oz-case-12, fetched 2026-09-01
Skip it if. You want to see the color of the finished drink. Amber hides it; the clear version of the same bottle does not.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
#2 · Bottling a gallon in six moves
The same swing top and amber glass at quart size, which turns a gallon batch into six bottles instead of ten and roughly halves the bottling job.
Who it is for. An established brewer bottling a gallon a week who is tired of filling ten bottles.
Source: MoreBeer published EZ Cap 32 oz amber listing, same product line as the specified 16 oz, morebeer.com/products/ez-cap-swing-top-bottles-amber-glass-32-oz-case-12, retrieved 2026-09-01
Skip it if. You are new to second ferment. Learn what your kitchen does to carbonation in 16 oz bottles, where the consequences are smaller.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
#3 · A bottle you would put on a table
Italian soda-lime glass with a published height and diameter and a hermetic clamp seal — the bottle that looks like a bottle, with the dimensions to check it fits a fridge door.
Who it is for. Someone bottling a lightly carbonated kombucha for the table, or storing finished kombucha in the fridge rather than conditioning it on a counter.
Source: Bormioli Rocco published Swing bottle specification (capacity, 12.13 in height, 3.5 in diameter, soda-lime glass, hermetic seal, care instructions), retailer specification listings retrieved 2026-09-01
Skip it if. You are chasing hard carbonation. Without a stated pressure rating, a bottle you are deliberately building pressure inside is a bottle you are guessing about — use the rated EZ Cap instead.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
#4 · Storing finished kombucha, not carbonating it
A cheap, well-dimensioned liter bottle with a clamp stopper and a published dishwasher limit — good storage, and explicitly the wrong tool for building pressure.
Who it is for. Someone who wants somewhere tidy to keep finished kombucha in the fridge, cheaply.
Source: IKEA published KORKEN product specification (capacity, 29 cm height, 9 cm diameter, materials, 70 C dishwasher limit), ikea.com KORKEN product page, retrieved 2026-09-01
Skip it if. You are doing a second ferment on the counter. Nothing published about this bottle supports holding carbonation pressure; use a rated swing top instead.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Every specification cited on this page came from one of these documents, retrieved on the date shown against the product it belongs to.
Bottles compared on published pressure ratings, closure type, glass color and size — and which bottles must never hold a second ferment.
Which swing tops publish a pressure rating, which are storage bottles wearing the same shape, and how to tell them apart before you fill them.
Batch size to jar size to bottles filled, with the headroom and surface-area rules that decide whether a vessel works.
Reserve the starter, strain, fill with headroom, seal and condition — with the quantities and the two things people get wrong.
Which bottles are built for pressure, which only look like it, and how to run a second ferment without cleaning kombucha off a ceiling.