Quick answer
Yes, you can safely put carbonated drinks like sparkling water or soda in a KeepCup Brew Cork Glass Cup. The cork band and glass body handle carbonation without any issue — no risk of leakage, breakage, or flavor transfer.
Brew Cork Glass Cup
Why the myth started
Some people worry that carbonation pressure might damage a glass cup or weaken a cork sleeve. But with a standard reusable cup designed for everyday hot and cold drinks, the gentle fizz from sparkling water or soda is no different from the air pressure created when you close a lid on any beverage.
What the cork sleeve actually does
The cork band on the Brew Cork Glass Cup is purely for grip and insulation — it doesn't seal the cup or hold pressure. Carbonation doesn't interact with cork in any harmful way, and the glass body is thick enough to handle the mild pressure of carbonated drinks without stress.
Brew Cork Glass Cup
Verdicts on common carbonation concerns
- Will carbonation damage the glass?: No. The glass body is designed for everyday use with hot and cold drinks. The mild pressure from carbonated beverages is well within normal use.
- Will the cork sleeve absorb flavors or odors?: No. Cork is naturally impermeable to liquids in this context. It won't absorb soda flavors or leave a cork taste in your drink.
- Can I put sparkling water in a cork cup long-term?: Yes. You can use it daily for sparkling water, soda, or any still beverage. The cup is reusable and built for repeated use. Rinse after each use to keep the cork band looking its best — but that's general care, not a carbonation issue.
Product facts
- Brew Cork Glass Cup: The Brew Cork Glass Cup combines the clean taste of glass with the natural warmth of cork, designed for everyday use. Glass doesn't absorb flavors or odors, so your sparkling water stays crisp and clean — no metallic or plastic aftertaste.
