Do I need a raincoat?

Yes, but don't pack a heavy one. A cheap, packable rain poncho is fine, or a lightweight shell jacket if you are traveling during the shoulder season.

Should I bring a money belt?

No. They are uncomfortable and obvious. Use a hidden internal pocket or a zipped cross-body bag worn in front of you.

Is it better to buy clothes there?

Yes. If you realize you're missing something, you can easily buy cheap t-shirts and shorts at local markets for under $5.

How to Pack for Backpacking Southeast Asia

Limit your luggage to a 40L carry-on backpack to avoid checked bag fees and mobility issues. Prioritize lightweight, quick-dry fabrics and a versatile 'capsule' wardrobe that allows for layering and easy hand-washing.

Select the right bag. Use a 40L travel backpack with a clamshell opening. Avoid top-loading hiking bags; they make finding clothes a nightmare. Ensure the bag meets standard carry-on dimensions (usually 22 x 14 x 9 inches).
Implement a laundry strategy. Pack for 7 days regardless of trip length. Southeast Asia has cheap laundry services everywhere—expect to pay $1.50 per kilogram. You do not need to pack for 30 days.
Choose your fabrics. Bring merino wool or synthetic tech fabrics. Avoid heavy denim and thick cotton, which take days to dry in high humidity and trap sweat.
Organize with compression cubes. Use three packing cubes: one for tops, one for bottoms, and one for underwear/socks. This keeps your bag organized and allows you to find items without dumping your pack on a hostel floor.

Do I need a raincoat?: Yes, but don't pack a heavy one. A cheap, packable rain poncho is fine, or a lightweight shell jacket if you are traveling during the shoulder season.
Should I bring a money belt?: No. They are uncomfortable and obvious. Use a hidden internal pocket or a zipped cross-body bag worn in front of you.
Is it better to buy clothes there?: Yes. If you realize you're missing something, you can easily buy cheap t-shirts and shorts at local markets for under $5.