Bottling & carbonation
A swing top is one purchase. A crown cap is three. What you get for the extra two is a seal that is brand new on every bottle, every time.
By Scooter M.·Published September 6, 2026 · Updated October 18, 2026
The short answer
Use crown caps if you bottle a full gallon at a time and want a brand-new seal on every bottle. You need three things, not one: 26 mm pry-off bottles, 26 mm caps, and a capper. Use swing tops if you bottle two or three at a time and want to open one without a tool. Both hold a second ferment; only the crown seal is new every time.
Both closures work. Kombucha has been second-fermented in both for as long as people have been doing it at home, and neither is a safety upgrade over the other. So the decision is not about which is better in the abstract — it is about four practical things, and they point in different directions depending on how you brew.
Everything below is scored on the same published rubric used across this site, and the weights are on the methodology page. We have not pressure-tested any of this; what we have done is find the makers who publish a number and hold them next to the ones who do not.
Two of these bottles state what they can take. That is unusual enough in this category that it is most of the argument for buying either one.
| Bottle | Closure | Published rating | Seal replaced |
|---|---|---|---|
| 12 oz amber longneck | 26 mm crown, pry-off | Up to 3 volumes of carbonation | Every bottling — a new cap |
| EZ Cap 16 oz amber | Swing top | 100 PSI | When the gasket perishes |
| Bormioli Rocco Swing 1 L | Swing top | — | When the gasket perishes |
The two ratings are not directly comparable, and it would be dishonest to pretend otherwise: one is a volume of dissolved CO2 and the other is a pressure in pounds per square inch, measured differently and stated for different purposes. What they have in common is that somebody was willing to write a number down. A decorative bottle with no rating at all is the thing to avoid, and that describes most glassware in most kitchens.
This is the part people discover after ordering the bottles. A case of longnecks is useless on its own. You need caps, which are consumable, and you need a capper, which is a tool. Budget for all three or the case sits in a cupboard.
Bottles with a published carbonation rating, standard 26 mm caps, and the bench capper that makes the whole thing fast rather than fiddly. All three, or none of them.
MoreBeer
A published carbonation rating, amber glass and a crown finish — the cheapest way to put a gallon of kombucha under pressure it was designed for.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
The Cary Company
Standard 26 mm steel crowns with an oxygen-scavenging liner — the consumable half of crown-cap bottling, and the reason the seal never wears out.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
Ferrari
A bench capper with a magnetic bell and a published 4-to-12-inch bottle range, which is the difference between capping a gallon in five minutes and dreading it.
#ad Price as of October 18, 2026. How this is funded.
Most crown caps sold to homebrewers now carry an oxygen-scavenging liner, described by the seller as absorbing leftover oxygen in the bottle neck to reduce oxidation. That is a real feature and it is a real benefit — for beer.
Kombucha is a different problem. The first fermentation is deliberately open to the air; the drink is acidic and full of live organisms that are entirely comfortable in that environment. Oxidation in the headspace is simply not the failure mode that ruins a bottle of kombucha. Under-carbonation is, and that has other causes.
So you are paying a small premium for a benefit that is mostly not yours. It is not a reason to avoid them — oxygen-absorbing caps are the caps that are stocked, they cost very little more, and they seal exactly as well. It is a reason not to pay extra hunting for them.
The mechanics are simpler than the equipment suggests. Fill to the shoulder, leaving the headspace the bottling method calls for. Set a cap on the bottle mouth. Bring the arm down. The bell crimps the skirt of the cap under the lip of the bottle in one motion, and it is done.
The published bottle range on a bench capper — 4 to 12 inches — is the specification worth checking against what you actually own, because a capper that will not reach your bottle is an expensive paperweight. Twelve-ounce longnecks and champagne bottles both sit inside that range comfortably.
A magnetic bell is not a luxury. Without it you are balancing a small steel disc on a wet bottle neck with one hand while pulling a lever with the other, and the cap goes on the floor about one time in five.
Crown caps fail in two ways, both of them recoverable. A cap crimped at an angle will leak slowly, which shows up as a bottle that never carbonates while its neighbors do. And a bottle with a chipped lip — usually from a wing capper used badly — will never seal again and should be retired rather than reused.
Swing tops fail in one way, and it is quieter. The gasket hardens, loses compression and stops sealing, often without any visible cracking. Gaskets and flat kombucha covers how to test one, but the short version is that a gasket is a wear part on a schedule you have to remember, and a crown cap is not.
That is the honest trade. Crown caps move the failure from a part you forget about to a step you perform, and steps you perform are easier to get right than parts you forget.
Over any single batch, swing tops are cheaper — there is nothing to buy after the bottles. Over years, the arithmetic narrows, because gaskets need replacing and caps are genuinely cheap per bottle. Neither difference is large enough to decide anything.
The cost that does decide it is space and setup. A bench capper is twelve pounds and it has to come out and go away every bottling day. If you brew a gallon a week and bottle ten at a time, that is a fair trade for a fast, reliable seal. If you bottle three bottles on a whim, it is not, and a swing top with a published pressure rating is the better purchase.
The appeal of crown caps is partly that the bottles are already in your recycling. That is true up to a point, and the point is the finish on the neck.
Hold a bottle upside down and look at the lip. A pry-off finish is a smooth ring with a single flared lip and no threads below it. A twist-off finish has visible spiral threads molded into the glass under the lip, and those threads are why a crown will not crimp cleanly against it. Most mass-market American beer is twist-off; most imported and craft beer is pry-off. Sort by looking, not by brand.
Two more checks before a salvaged bottle joins the rotation. Run a thumbnail around the lip: any chip, however small, means the cap has nowhere clean to seal and the bottle is scrap. And hold it up to the light — a bottle that has been through a dishwasher a hundred times develops a haze that is cosmetic, but visible internal scratching is not, because a scratched interior is a weak point under pressure.
Labels come off with a long soak in hot water; the adhesive on most modern labels releases in twenty minutes or so. It is worth doing, because an old label on a bottle of kombucha is exactly how somebody in the house ends up drinking the wrong thing.
There are two shapes of hand capper and the difference matters more than the price gap suggests.
A wing capper is the cheap one: two levers you press down with both hands while the bottle stands on the counter. It works, and it is what most people start with. Its weakness is that all the force comes from your arms, unevenly, and any tilt puts a sideways load on the bottle lip. That is the mechanism behind almost every chipped neck in a home setup.
A bench capper is mounted or weighted, holds the bottle square underneath, and drives the bell straight down through a single arm. The force is aligned by the tool rather than by your technique, which is why it is both faster and gentler. The published 4-to-12-inch range means one tool covers everything from a twelve-ounce longneck to a champagne bottle, which matters if you ever bottle a larger format.
If you are bottling a gallon at a time, the bench capper is the one worth owning. If crown caps are an occasional experiment alongside a swing-top habit, a wing capper is a reasonable place to find out whether you like the method before committing counter space to it.
There is a fourth purchase nobody lists and everybody eventually makes. A longneck has a neck far narrower than a hand, so residue sits where you cannot reach it, and a bottle brush published at 16 inches with a 2.75 inch head covers the whole 12-to-22 oz range — funnels, fillers and bottle brushes covers it alongside the tools that get the kombucha in there in the first place.
If you already own a capper and a crate of longnecks because you brew beer, you have already solved the part of kombucha that most new brewers have not even reached yet. Brewing kombucha when you already brew beer covers what else on that shelf transfers, the two adjustments to make to your bottling routine, and the three pieces of kit to leave in the cupboard.
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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 MoreBeer Traditional Longneck Beer Bottles, Amber, 12 oz (Case of 24) A published carbonation rating, amber glass and a crown finish — the cheapest way to put a gallon of kombucha under pressure it was designed for. | Bottling a whole gallon in one sitting | 8.3out of 10 | |
| 2 | Score7.4 The Cary Company Beer Bottle Caps, Oxygen Absorbing, 26 mm Pry-Off (144/bag) Standard 26 mm steel crowns with an oxygen-scavenging liner — the consumable half of crown-cap bottling, and the reason the seal never wears out. | A fresh seal on every single bottle | 7.4out of 10 | |
| 3 | Ferrari Super Agata Bench Capper A bench capper with a magnetic bell and a published 4-to-12-inch bottle range, which is the difference between capping a gallon in five minutes and dreading it. | Capping a whole batch without a fight | 7.8out of 10 | |
| 4 |  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 | |
| 5 |  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 |
#1 · Bottling a whole gallon in one sitting
A published carbonation rating, amber glass and a crown finish — the cheapest way to put a gallon of kombucha under pressure it was designed for.
Who it is for. Anyone bottling a full gallon at once who wants a fresh, gasket-free seal on every bottle and does not mind owning a capper.
Source: MoreBeer published product specification for 12 oz amber traditional longneck beer bottles, case of 24 (capacity, glass color, case quantity and dividers, 26 mm crown finish, “up to 3 volumes of carbonation”, amber UV statement), morebeer.com, retrieved 2026-09-06
Skip it if. You bottle two or three at a time and want to open one without a tool. A swing top is the better fit for small, casual batches.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
#2 · A fresh seal on every single bottle
Standard 26 mm steel crowns with an oxygen-scavenging liner — the consumable half of crown-cap bottling, and the reason the seal never wears out.
Who it is for. Anyone running crown-cap bottles who wants the seal to be a fresh consumable rather than an aging rubber ring.
Source: The Cary Company published specification for oxygen-absorbing 26 mm pry-off crown beer bottle caps, 144/bag (diameter, crown type, steel construction, count, oxygen-scavenger liner description), thecarycompany.com, retrieved 2026-09-06
Skip it if. You are bottling into swing tops. These fit nothing you own, and a swing-top gasket is the part to replace instead.
#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.
#3 · Capping a whole batch without a fight
A bench capper with a magnetic bell and a published 4-to-12-inch bottle range, which is the difference between capping a gallon in five minutes and dreading it.
Who it is for. Someone bottling a gallon or more at a time on a regular schedule, who wants capping to be the fast part of bottling day.
Source: Ferrari Super Agata bench capper specification as published across homebrew retailer listings and the Amazon product listing (4-12 in bottle range including champagne bottles, spring-loaded button-adjusted head, magnetic bell housing, metal and plastic construction, 7.9 in assembled height, 12 lb assembled weight), retrieved 2026-09-06
Skip it if. You bottle a few swing tops at a time. A capper is a purchase that only pays back if crown caps are your standing method.
#ad Price as of October 18, 2026. How this is funded.
#4 · 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 Price as of October 18, 2026. How this is funded.
#5 · 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 Price as of October 18, 2026. 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.
Why a perished gasket is the most common cause of a flat second ferment, how to test a seal in two minutes, and when to replace.
Reserve the starter, strain, fill with headroom, seal and condition — with the quantities and the two things people get wrong.
The five causes of a flat second ferment, ranked by how often each is actually the problem — starting with the one nobody checks.
Funnels, spring-tip fillers and bottle brushes compared on published dimensions — and the spigot trick that sets your headspace automatically.
Keg sizes, pressure ratings and the gas side compared on published figures — plus the ten-dollar cap that carbonates without a keg at all.
The only bottle on this site whose maker publishes a pressure rating, reviewed on that figure — and on everything the listing declines to state.
What a homebrew shelf already covers, what to leave in the cupboard, and the two purchases kombucha genuinely needs.