Fizzy Drinks in a Glass Core Bottle: What to Know First
By ZOKU | Live Creatively | Published: 2026-11-03
Category: Tips & Care
Carbonated drinks in a glass core bottle can work if you manage pressure. Learn the symptoms, causes, and fixes, plus when to choose another bottle.
Quick answer
You can put carbonated drinks in a ZOKU Glass Core Bottle, but only if you leave room for pressure and open the cap gradually. Never shake the bottle or fill it to the brim, and avoid storing fizzy drinks in any bottle that is not designed to vent pressure.
Why glass core bottles handle carbonation differently
The borosilicate glass core is non-porous, so it will not retain the flavor of sparkling water or soda the way some plastic bottles can. That makes it a good choice for switching between fizzy and still drinks. However, the bottle’s leak-proof cap is designed to seal, not to release pressure. When carbon dioxide builds up, the pressure has nowhere to go until you open the cap. That is why the opening technique matters more than the bottle material itself.
When to skip fizzy drinks in this bottle
If you need a bottle that can sit in a hot car or be tossed into a bag without a second thought, a glass core bottle is not the best match for carbonated drinks. Heat increases pressure inside any sealed bottle, and the glass core—while durable—is still glass. For those situations, choose a stainless steel bottle that is explicitly rated for carbonation, or carry still drinks instead. Also, do not use the glass core bottle for fermented homemade sodas or kombucha, which continue to produce gas after sealing.
Diagnose your fizzy drink problem
- Cap is hard to turn or bulges: Pressure has built up inside the sealed bottle. Point the cap away from your face, wrap a cloth around it if needed, and turn slowly in small increments to let gas escape before fully opening. If the cap will not budge, stop and let the bottle sit at room temperature for 10 minutes before trying again.
- Drink sprays out when you open: The bottle was likely overfilled or shaken. Fill only to the shoulder of the bottle, leaving at least an inch of headspace, and never shake a carbonated drink. Open over a sink and in small turns. For future fills, measure your liquid and leave headspace every time.
- Drink goes flat too fast: A wide mouth and frequent opening release carbonation quickly. Keep the cap on between sips and consider transferring the drink to a smaller bottle if you will not finish it in one sitting. If flatness is a dealbreaker, use a bottle designed specifically for carbonated drinks.
- Glass core feels loose or damaged: Stop using the bottle immediately. A damaged glass core can compromise safety and pressure resistance. Contact ZOKU support for replacement options. Never use a bottle with a cracked or loose glass core, even for still drinks.
Product facts
- 16oz Grey Glass Core Bottle - Blue: The 16oz Grey Glass Core Bottle has a double-wall design with a borosilicate glass core and a leak-proof 1/4-turn locking cap. The glass core keeps flavors neutral, but the secure cap means you control pressure release by opening slowly.
16oz Grey Glass Core Bottle - Blue
