Carry-On Only
The 7kg, 22-inch playbook — one bag, no waiting at the carousel, no lost luggage in Hanoi.
Travelling carry-on only is the single biggest quality-of-life upgrade most travellers can make. It is also the one most people resist hardest, because the case for it sounds like deprivation and the case against it is one bad memory of a winter trip with a borrowed jacket. The truth is more boring: with a sensibly chosen bag and a small number of versatile pieces, almost any trip up to two months — including Hokkaido in January and Bali in August — fits in a single carry-on. The trick is committing to the constraint early enough that your packing list adjusts to it.
Table of Contents
- Why Bother
- The Bag Itself
- The Clothing Math
- Packing Cubes vs. Compression Sacks
- What Airlines Actually Weigh
- The Rule-Bender: A Personal-Item Daypack
Why Bother
The obvious reasons are the practical ones. You do not wait at the carousel. Your bag is not lost when your connection in Doha is forty minutes. You can take the train from the airport instead of a taxi because you can actually carry your luggage up the stairs at the station. You can change hotels in the middle of the day without dragging a hard-shell suitcase across cobblestones in Hoi An. The less obvious reason is psychological — a small bag forces a small wardrobe, and a small wardrobe means you stop thinking about clothes. The morning question of what to wear becomes one of three answers, and the trip gets a little more space in your head for the place you came to see.
The Bag Itself
The international carry-on standard is roughly 22 x 14 x 9 inches (56 x 36 x 23 cm) and 7kg, with the smaller Asian carriers (AirAsia, VietJet, ANA on certain fares) the strictest enforcers. Within that envelope you have two real choices: a 30L travel pack or a 40L. The 40L is the maximum you can plausibly fit in the overhead bin and will comfortably hold a two-week trip with a jacket. The 30L forces a tighter wardrobe but is genuinely small — you can wear it on a city walk without looking like a tourist, and no gate agent will ever ask to weigh it.
A few things that matter more than the brand. A clamshell opening (zips around three sides like a suitcase) makes packing twice as fast as a top-loader. Stowable backpack straps let you carry it on rough ground and look like a piece of luggage at a hotel check-in. A separate, padded laptop sleeve accessed from the outside is worth the extra weight. Wheels are personal — useful in airports, useless on Bali side streets — and the honest answer for most travellers in Asia is to skip them.
The Clothing Math
For a trip of any length up to about two months, the working wardrobe is roughly the same. The 5/4/3/2/1 rule is a useful starting point: five shirts, four pairs of socks and underwear, three bottoms, two pairs of shoes, one warm layer. You launder every four or five days and the load never grows. Adjust upward for cold (one extra mid-layer) and downward for hot (drop one bottom).
- Shirts (5): three merino t-shirts, one button-down for nicer dinners and temple visits, one long-sleeve technical shirt for sun and bugs.
- Bottoms (3): one pair of travel pants that look like normal trousers, one pair of shorts, one pair of lightweight technical pants for hiking or cold flights.
- Socks & underwear (4 each): merino if you can, synthetic if you can’t. Cotton is the wrong answer in every climate.
- Shoes (2): one pair of walking shoes you can wear all day on stone, one pair of sandals that can get wet and survive temple-stair scrambles.
- Warm layer (1): a light down or synthetic jacket that compresses to the size of a grapefruit. Add a shell if rain is in play.
Packing Cubes vs. Compression Sacks
Packing cubes are organisational; compression sacks are volumetric. The difference matters. Cubes do not save space — they save time, by turning a single chaotic bag into four small drawers you can pull out at a guesthouse and put back in five minutes. Compression sacks (the kind with a one-way valve, or the rolling kind that squeeze air out) do save space, sometimes a lot of it, but at the cost of badly wrinkled clothes and a bag that takes longer to repack.
The pragmatic answer is to use cubes for everything you wear regularly — shirts in one, socks and underwear in another, bottoms loose at the bottom — and to use a single compression sack only for the bulky cold-weather layer you are not going to wear for the next two weeks. The down jacket compressed to the size of a small loaf of bread, the rest of the bag breathing.
What Airlines Actually Weigh
The 7kg limit is real on AirAsia, VietJet, Scoot, Cebu Pacific, and most other low-cost Asian carriers, and they will weigh your bag at the gate if it looks heavy. They almost never measure dimensions if the bag is obviously cabin-sized. Full-service Asian carriers (Singapore, ANA, JAL, Thai) post 7kg but rarely enforce on international long-haul. American and European carriers usually do not weigh carry-on at all, but Ryanair and Wizz are the European exceptions and the harshest of all.
The practical rule: if you are flying any low-cost carrier in Asia or Europe, hit 7kg honestly, including your laptop. The trick is the personal-item daypack, below.
The Rule-Bender: A Personal-Item Daypack
Almost every airline allows a “personal item” in addition to carry-on — a small bag that fits under the seat. A 15- to 20-litre packable daypack is the right size. On the way to the airport, it holds your laptop, charger, headphones, a paperback, and the dense items (camera, power bank) that would otherwise push your main bag over 7kg. At the destination, it folds flat or becomes your day bag for hikes, beaches, and city walks. This is the legal way to add three or four kilos of capacity without crossing any airline’s line.
Carry-on only is a habit more than a kit. The first trip is hard; the third is automatic. By the fifth you will not remember why you ever checked a bag.