Quick answer
If your cork glass cup leaks, the issue is usually with the lid seal, cork sleeve fit, or glass rim damage. This guide walks you through diagnosing and fixing the most common causes.
Why seals fail over time
Daily use, temperature changes, and cleaning methods can gradually degrade the silicone gasket inside the lid. Even a tiny gap or worn spot can let liquid escape, especially when the cup is tipped or shaken.
The cork sleeve factor
The natural cork sleeve provides insulation and grip, but it can expand or contract with humidity. If the cork swells, it may push the glass slightly out of alignment with the lid, breaking the seal. Conversely, if it dries and shrinks, the cup might not sit snugly in the lid.
Diagnosis & fix steps
- Symptom: Liquid seeps from the lid when the cup is tilted or shaken. Check if the leak is constant or only on one side.
- Likely cause: Worn or misaligned silicone gasket inside the lid, or a damaged glass rim. Inspect the gasket for cracks or debris. Also run a finger around the glass rim to feel for chips.
- Corrective action: Remove the lid gasket, wash it in warm soapy water, dry thoroughly, and re-seat it firmly. If the gasket is damaged, replace it (check with KeepCup for spare parts). For a chipped rim, stop using the cup—it cannot be sealed reliably. If the rim is chipped, do not attempt a fix; the cup is no longer leak-proof.
Product facts
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Brew Cork Glass Cup: Bought this for a Father’s Day present for the Hubby and he uses it all the time. Great to prepare your drink and have it later. This real-world feedback shows that when the seal works properly, the cup is reliable for daily use and keeps drinks ready for later without leaking.
Brew Cork Glass Cup
