Bottling & Carbonation

Swing-Top Bottles

Reusable pressure-rated bottles with a wire bail — the standard choice for the second fermentation.

Swing-Top Bottles — original illustration

Original illustration — a generic example of this tool, not a specific product.

Specifications

Category
Bottling & Carbonation
Type
Pressure-rated swing-top with a wire bail and ceramic stopper
Volume
Commonly 500 ml, 750 ml or 1 L
Pressure rating
Manufacturer-rated for carbonated beverages
Gasket
Food-grade rubber or silicone; replace when cracked or stiff
Condition
No chips, no star cracks, no cloudiness in the glass
Avoid
Decorative bottles, still-water bottles, square shoulders, thin glass
Typical batch size
Typically 16–34 fl oz (0.5–1 L) each

Swing-Top Bottles

Reusable pressure-rated bottles with a wire bail — the standard choice for the second fermentation.

The second fermentation happens in the sealed bottle, which means the bottle has to hold pressure. Swing-top bottles designed for carbonated drinks are built for it, and their ceramic stopper and rubber gasket seal reliably and can be re-used many times. Avoid decorative bottles, bottles that held still water, and anything without a pressure rating, however good it looks.

bottling reusable pressure rated
Best for
Bottling, Second Fermentation
Batch size
Typically 16–34 fl oz (0.5–1 L) each

Applicable brewing stages

  • First Fermentation
  • Second Fermentation
  • Flavoring
  • Bottling
  • Cleaning & Testing

A highlighted stage means this tool has a direct role at that point in the process. Ticking several stages is normal — a thermometer, for example, is useful during both the first and second fermentation.

Safety notes

Over-carbonation is the single most serious risk in home kombucha. If you bottle kombucha with too much sugar, or bottle before the first fermentation is finished, pressure builds until the glass fails. Always use bottles rated for carbonated drinks, never fill above the manufacturer’s fill line, and store bottles somewhere that a burst would not cause injury — inside a closed box or cupboard, away from faces and walkways. Chill bottles before opening and open them over a sink. Wrap a towel around the bottle and point the cap away from yourself. If a bottle has visibly deformed or the cap is domed, do not open it indoors.

Practical guidance

  • Use only one type and size of bottle so every bottle carbonates at the same rate.
  • Fill to about 1.5 to 2 inches (4–5 cm) of headspace, no more and no less.
  • Replace rubber gaskets every few months; a worn gasket leaks and you lose carbonation.
  • Write the bottling date on the gasket side of the bottle with a glass marker.

Please read before you brew

This page is educational reference material, not professional brewing, food-safety or medical advice. Equipment handling, hygiene practice and local rules vary, and nothing here guarantees a particular brewing result.

  • Home brewing rules differ by country, state, province and municipality, and they change over time. Check your own local requirements — including any permit, licence, volume limit or minimum age — before you brew, bottle or share what you make.
  • Use food-grade equipment only. Vessels, bottles, tubing and utensils that were not made for food or drink may release unwanted compounds or shelter microbes.
  • Work in a well-ventilated space, keep hot liquids away from children and pets, and follow the manufacturer's instructions for every appliance you use.
  • Bottles under pressure can fail. Use bottles designed for carbonated drinks, do not over-prime, and refrigerate once the carbonation is right.
  • For anything involving gas pressure, electricity, high heat, chemical cleaners or acids, consult a qualified professional.

Finished kombucha contains trace alcohol and caffeine. It is not suitable for children, and anyone who is pregnant, breastfeeding, immunocompromised, diabetic or taking medication should speak to a healthcare professional before drinking it. Kombucha is a food, not a medicine, and it does not treat, cure or prevent any disease.

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