Tea Infuser Bottle Leaking? 5 Causes and Easy Fixes

By Saran Reddy | Last Updated: April 20, 2026

A tea infuser bottle leaking from the lid or base is one of the most common complaints — and usually the easiest to fix. Your infuser bottle is leaking. There is tea on your desk, in your bag, or on your shirt. Before you blame the bottle, check these five common causes. Most leaks have a simple fix that takes less than a minute. Here is how to find the problem and solve it.

Cause 1: The Silicone Gasket Is Worn Out

The gasket is the rubber ring inside the lid that creates a seal. Over time, it stretches, cracks, or picks up a permanent shape. When it no longer sits flat, water escapes through the gap. This is the number one cause of infuser bottle leaks.

Check the gasket by pulling it out of the lid. Look for:

• Cracks or tears in the rubber
• A permanent groove or deformation from being compressed
• Hardening — if the gasket feels stiff instead of flexible, it is old
• Mould or discolouration (which can prevent a clean seal)

Fix: If the gasket is damaged, replace it. Most brands sell replacement gaskets. If you cannot find one, contact the brand directly. A new gasket costs much less than a new bottle.

If the gasket looks fine but the bottle still leaks, try removing it, washing it, and reseating it. Sometimes it just shifts out of position.

Cause 2: The Lid Is Cross-Threaded

Cross-threading happens when you screw the lid on at a slight angle. The threads do not align properly, and the lid sits crooked. It feels tight but does not seal. Water leaks from the uneven gap.

Fix: Unscrew the lid completely. Hold the bottle upright and place the lid straight on top. Turn it gently until you feel the threads catch. Then tighten normally. If you feel resistance before the lid is fully closed, stop — back it off and try again. Cross-threading can strip the threads over time, so be careful.

Cause 3: You Are Overfilling the Bottle

If you fill the bottle to the very top and then insert the strainer, the displaced water has nowhere to go. It spills out through the lid when you close it.

Fix: Leave a small air gap at the top — about 1-2 centimetres. Insert the strainer first, then add water to just below the strainer top. This gives the water room to move without overflowing when you seal the lid.

Cause 4: Steam Pressure from Hot Tea

When you pour boiling water into the bottle and seal the lid immediately, the steam creates pressure inside. This pressure pushes water through any tiny gap in the seal. The result: a slow leak or a sudden spray when you open the lid.

Fix: After pouring hot water, wait 30-60 seconds before sealing the lid. This lets the initial burst of steam escape. Or leave the lid slightly loose for the first minute, then tighten once the steam settles. The InstaCuppa Glass Tea Infuser Bottle handles hot water well, but even the best seal can be overcome by steam pressure if you seal too quickly.

Cause 5: The Glass or Lid Is Cracked

A hairline crack in the glass body or a crack in the plastic lid can cause slow leaks that are hard to spot. Run your finger along the bottle and lid to feel for anything unusual.

Fix: If the glass is cracked, stop using the bottle. Even a small crack can spread and break under temperature changes. If only the lid is cracked, contact the brand for a replacement lid. If the glass body is cracked, it is time for a new bottle.

To prevent cracks, avoid sudden temperature shocks with non-borosilicate bottles. Borosilicate glass (like the InstaCuppa bottles) handles hot-to-cold swings well, but even borosilicate should not go from a freezer directly to boiling water.

How Do You Test Where the Leak Is Coming From?

Fill the bottle with water. Close the lid tightly. Turn it upside down over a sink. Watch where the water appears. If it comes from the lid, the gasket or threading is the issue. If it comes from the body, the glass may be cracked.

1. Fill the bottle with room-temperature water.
2. Dry the outside completely with a towel.
3. Close the lid as tightly as you normally would.
4. Turn the bottle upside down and hold it over a sink.
5. Watch for 30 seconds. Look for droplets forming on the lid, the threads, or the body.

This tells you exactly where to focus your fix. Most of the time, the leak is at the lid — either the gasket, the threading, or steam pressure.

When Should You Replace the Gasket vs the Whole Bottle?

Replace the gasket if it is worn, cracked, or deformed — this fixes most leaks. Replace the bottle if the glass is cracked, the lid threads are stripped, or the leak persists after a new gasket.

• Replace the gasket: If it is more than 6-12 months old and used daily. Gaskets are cheap and easy to swap.
• Replace the lid: If the threads are stripped or the lid has a crack. Some brands sell replacement lids separately.
• Replace the bottle: If the glass has a crack, chip, or visible damage. Do not risk using cracked glass — it can break suddenly when exposed to heat.

Frequently Asked Questions

Can I use Teflon tape on the lid threads to stop leaking?

It can help as a temporary fix, but it is not ideal for a bottle you drink from daily. A new gasket is a better long-term solution.

Why does my bottle leak only when it is on its side?

This usually means the gasket is slightly worn. It holds up when the bottle is upright (gravity helps) but cannot resist sideways water pressure. Replace the gasket.

Can I carry a hot tea infuser bottle in my bag?

Yes, if the seal is good. Test it first with the upside-down method. Wait 30 seconds after adding hot water before sealing. Use a protective sleeve to prevent heat damage to your bag.

My bottle leaked the very first time. Is it defective?

Possibly. But first check: is the gasket seated properly? Is the lid cross-threaded? Is the bottle overfilled? If all three are fine and it still leaks, contact the seller for a replacement.

How long does a silicone gasket last?

With daily use and proper cleaning, a silicone gasket lasts 6-12 months. If you boil it regularly for deep cleaning, it may last shorter. Keep a spare gasket on hand.

Related Reads

• How to Clean an Infuser Bottle: Remove Mould, Stains and Smell
• Tea Infuser Bottle for Office: Brew Loose Leaf at Your Desk