Does cotton really stay wet that long?

Yes. In 80%+ humidity, the air is already saturated. Moisture cannot evaporate from the fabric effectively, so a heavy cotton t-shirt can stay clammy for over 48 hours.

Should I bring a rain jacket?

Bring a shell, but make sure it has no lining. If it's a 'breathable' membrane like Gore-Tex, it may still feel like a sauna in high heat. A simple, thin, unlined water-resistant poncho is often better.

How do I deal with damp clothes in my luggage?

Bring a few mesh dry bags. If you have to pack something that isn't fully dry, keep it in a mesh bag outside of your main suitcase to allow airflow.

How to Pack for High Humidity Travel

Prioritize natural, moisture-wicking fabrics like linen, bamboo, and lightweight merino wool that dry quickly. Avoid synthetic blends like heavy polyester or thick cotton, which trap sweat and moisture against your skin.

Select the right fabrics. Stick to 100% linen, loose-weave hemp, or bamboo fabrics. These materials have high breathability and allow airflow. Avoid denim, heavy twill, or thick cotton hoodies, as these take days to dry if they get wet from humidity or rain.
Use the 'loose fit' rule. Pack clothing that fits loosely against the body. Tight-fitting shirts or leggings trap moisture against your skin, which leads to chafing and discomfort. Opt for wide-leg pants and boxy, oversized tops.
Pack for rapid laundry turnaround. Bring enough clothes for 4 days and plan to wash them. In high humidity, clothes will not air-dry overnight; plan for at least 24 hours of drying time. Use a portable laundry kit with biodegradable detergent sheets.
Choose moisture-wicking undergarments. Cotton underwear is your enemy in the tropics; it stays damp. Swap your standard cotton pairs for moisture-wicking synthetic or merino wool options designed for active use to prevent skin irritation.

Does cotton really stay wet that long?: Yes. In 80%+ humidity, the air is already saturated. Moisture cannot evaporate from the fabric effectively, so a heavy cotton t-shirt can stay clammy for over 48 hours.
Should I bring a rain jacket?: Bring a shell, but make sure it has no lining. If it's a 'breathable' membrane like Gore-Tex, it may still feel like a sauna in high heat. A simple, thin, unlined water-resistant poncho is often better.
How do I deal with damp clothes in my luggage?: Bring a few mesh dry bags. If you have to pack something that isn't fully dry, keep it in a mesh bag outside of your main suitcase to allow airflow.