Southeast Asia asks less of your suitcase than you think. It is hot, humid, cheap to buy what you forget, and relaxed about almost everything except temple dress — so the winning strategy is to pack light, breathable, and modest, then leave room for what you’ll inevitably buy. This is the carry-on-sized list we’d take for a few weeks across Thailand, Vietnam, Bali, and beyond, organised so you can tick it off. Two non-negotiables to sort before you fly: a travel eSIM so maps, Grab, and messaging work the moment you land, and travel insurance (scooters and stomach bugs are the two great certainties — see our travel insurance comparison).
Bags: go carry-on
You do not need a big bag here. A 40-litre carry-on backpack or a light wheeled case is plenty, and it saves you from checked-baggage waits and internal-flight fees. Inside, a set of packing cubes keeps the humidity-crumpled chaos organised, and a small daypack handles temple days and boat trips. Add one thing most people forget: a lightweight dry bag, invaluable for island-hopping, kayaking, and sudden downpours.
Clothes: light, breathable, and temple-ready
Pack for heat and humidity: loose cotton and linen, quick-dry shirts, and shorts, plus swimwear you can live in. The one rule that trips people up is temple dress — the Grand Palace, Angkor, Balinese temples, and many others require shoulders and knees covered for everyone. Carry a light scarf or sarong (it doubles as a beach layer, a blanket on cold buses, and modesty cover in an instant), a pair of long, loose trousers, and one modest top. Footwear is simple: comfortable sandals for daily wear and one pair of trainers for temples, treks, and long walking days. Add a light rain layer if you travel in monsoon season.
Tech: adapter, power, connectivity
The region is a patchwork of plug types, so bring a universal travel adapter — a good all-in-one adapter covers Thailand, Vietnam, Malaysia, and Indonesia in one. A power bank is essential for long temple days and boat trips far from a socket (pack it in your carry-on, never checked). Your travel eSIM replaces the old hunt for a SIM kiosk, and a cheap waterproof phone pouch pays for itself the first time you’re on a longtail boat.
Health and toiletries: the tropical essentials
This is where Southeast Asia differs from a European trip. Pack a strong insect repellent (DEET or picaridin — dengue is a real, year-round risk in much of the region), a high-SPF reef-safe sunscreen (expensive and hard to find locally), and a small medical kit: rehydration salts for the near-inevitable upset stomach, anti-diarrhoeals, plasters, and any prescription medicines in their original packaging. Hand sanitiser, a refillable water bottle (tap water isn’t drinkable — most guesthouses offer refills), and biodegradable wet wipes round it out. Everything else — shampoo, toothpaste — is cheap to buy on arrival, so travel with minis.
Documents and money
Carry your passport with at least six months’ validity beyond your travel dates (many countries require it), plus photocopies or phone photos of the ID page and any visas, stored separately. Bring a couple of debit/credit cards (tell your bank you’re travelling) and some US dollars as a clean backup — useful for visa-on-arrival fees and emergencies. A slim money belt or a hidden pocket eases the mind in crowded markets, though Southeast Asia is generally very safe.
The honest short version
If you remember only five things: pack carry-on light, bring temple-appropriate cover, sort your eSIM and insurance before you fly, carry repellent and sunscreen, and leave space for the tailored clothes, coffee, and crafts you’ll carry home. The region will happily provide the rest — often better and cheaper than what you left behind.
Frequently asked questions
Do you need a big backpack for Southeast Asia?
No — a 40-litre carry-on backpack or a light wheeled case is plenty. The region is hot, laundry is cheap and quick, and it is easy to buy anything you forget. Travelling carry-on also saves you from checked-baggage fees on the region's frequent internal flights.
What should you wear to temples in Southeast Asia?
Shoulders and knees must be covered for everyone at major temples such as the Grand Palace, Angkor and Balinese temples. The easiest solution is to carry a light scarf or sarong plus a pair of long loose trousers — the sarong also works as a beach layer and a bus blanket.
What health items are essential for Southeast Asia?
Strong insect repellent with DEET or picaridin (dengue is a year-round risk), a high-SPF reef-safe sunscreen (expensive locally), and a small medical kit with rehydration salts and anti-diarrhoeals for the common upset stomach. Bring prescription medicines in their original packaging.
Should you sort an eSIM and insurance before flying?
Yes. A travel eSIM means maps, Grab and messaging work the moment you land, with no SIM-kiosk hunt. And travel insurance matters more here than most places — scooter accidents and stomach bugs are the two most common claims, so arrange cover before you go.
Keep reading on Gently Yonder
- Airalo vs Holafly vs Saily — The three big travel eSIM providers compared — coverage, pricing, and who each suits.
- Travel Insurance Compared — SafetyWing vs World Nomads vs Genki — coverage, exclusions, and how to choose.
- Airport Security Liquids Checklist — The 100ml rule made simple — containers, the clear bag, common rejections.
- Thailand: A 10-Day Itinerary — Bangkok, Chiang Mai, and the Andaman islands in ten days, linked by cheap internal flights.
- Bali: A 7-Day Itinerary — Ubud's hills, the great temples, the surf south, and a Nusa Penida boat trip in a week.