Do I need a suitcase with wheels?

No. Southeast Asian sidewalks are often uneven, under construction, or nonexistent. A backpack is much easier to navigate through crowds and onto local buses.

Should I bring a sleeping bag?

No. Hostels provide linens. If you are worried about hygiene, bring a silk sleeping bag liner instead; it packs down to the size of a soda can.

Is it better to pack winter clothes if I'm visiting mountains?

Only if you have a specific trekking trip planned. Otherwise, buy a cheap fleece or hoodie at a local market in places like Sapa or Chiang Mai if you get cold.

How to pack a backpack for Southeast Asia

Pack for one week of laundry, not for the duration of your trip. Limit your total bag weight to 10kg (22lbs) so you can carry it on all regional flights and walk comfortably in tropical heat.

Select the right bag. Use a 40L to 45L travel backpack that opens like a suitcase (clamshell style). Avoid top-loading hiking packs; they make accessing items at the bottom impossible in a hostel.
Use packing cubes. Use three cubes: one for tops, one for bottoms, and one for underwear/socks. This compresses your clothes and keeps your bag organized when you’re living out of it.
The 'One Week' Rule. Bring 7 pairs of underwear, 5 lightweight t-shirts, 2 pairs of shorts, 1 pair of linen pants, and 1 light rain shell. You can find laundry services for $1-2 per kilogram everywhere in the region.
Minimize toiletries. Pack only travel-sized liquids. You can buy shampoo, soap, and sunscreen at any 7-Eleven in Thailand, Vietnam, or Indonesia for the same price or cheaper than at home.
Electronics and security. Keep your passport, cards, and phone in a small daypack that stays on your front or under your seat. Bring a universal power adapter and a 10,000mAh power bank for long bus rides.

Do I need a suitcase with wheels?: No. Southeast Asian sidewalks are often uneven, under construction, or nonexistent. A backpack is much easier to navigate through crowds and onto local buses.
Should I bring a sleeping bag?: No. Hostels provide linens. If you are worried about hygiene, bring a silk sleeping bag liner instead; it packs down to the size of a soda can.
Is it better to pack winter clothes if I'm visiting mountains?: Only if you have a specific trekking trip planned. Otherwise, buy a cheap fleece or hoodie at a local market in places like Sapa or Chiang Mai if you get cold.