This topic is about dealing with ostomy pouch leakage caused by gas expansion during flights. A traveler shared their experience of having wet patches on their clothes during flights to and from Malta, despite emptying their stoma pouch before boarding. They are seeking advice from others who might have faced similar issues and how to prevent them. Here are some helpful tips and insights:

1. Air expansion and cabin pressure:
- Any air left in the pouch will expand as the cabin pressure drops. Be sure to "burp" or roll out all air from the pouch before take-off.
- Plan to visit the aircraft lavatory about 30 minutes after take-off to release any air that has accumulated.

2. Use filtered pouches:
- Consider switching to filtered bags that allow gas to escape gradually. Many travelers report no inflight problems when using these.

3. Pre-boarding routine:
- Empty the pouch immediately before boarding to keep it as flat as possible.
- Avoid carbonated drinks and other gas-producing foods before and during the flight. Stay well-hydrated with water.
- Some people also limit sugar and dairy, such as yogurt, which can increase gas.

4. Carry adequate supplies:
- Keep extra pouches, wafers, disposal bags, a full change of clothes, and cleaning materials in your hand luggage in case your checked bags are lost.
- Wear an absorbent backup garment, like Depends Silhouettes, for additional security.

5. Documentation:
- Carry a doctor’s letter explaining that your ostomy supplies are medical devices. This can help ease any security questions at the gate.