A good carry-on isn't about the bag — it's about what's inside. After years of red-eyes, missed connections and unscheduled overnight stays on terminal floors, the items I never travel without are not the ones the brochure tells you to pack. They're small, cheap, and mostly forgotten. Here's the 2026 edition of what actually earns its place in a cabin bag — and what the new airport rules have quietly changed.
What 2026 changed for carry-on bags
The big shift this year is the continued rollout of CT (computed-tomography) scanners at major airports. London Heathrow, Gatwick, Manchester and Edinburgh now use them in most lanes, as do JFK's T7 and T8, Schiphol, Frankfurt and Dubai DXB. Where these scanners are deployed, you don't have to take laptops or liquids out — and the liquids limit has been raised to 2 litres per container in many lanes.
But there's a catch worth knowing about: not every lane in those airports has the new scanners, and the EU temporarily reinstated the 100ml rule across the Schengen area in 2024 after a scanner-firmware issue. Some airports flip-flopped again in early 2026. Treat the new generous rules as a possibility, not a guarantee. The safest assumption is still the 100ml / 1-litre bag rule until you see the lane in front of you.
Also new in 2026: stricter enforcement of power-bank watt-hour limits. Several airlines have begun visibly checking power-bank labels at the gate, particularly on long-haul routes from Asia. Anything over 100Wh now needs explicit airline approval; anything over 160Wh is rejected at the gate without exception.
The forgotten essentials
1. A 2-metre USB-C cable, not the 50cm one in the box
The single best £8 you can spend before a flight. Modern aircraft seats put the USB outlet in places designed by someone who has never tried to use one — under the screen, between seats, halfway down the back of the seat in front. The short cable that came with your phone is always 30cm too short. A long, braided, USB-C-both-ends cable solves the problem instantly and works with most laptops, tablets and the seat-back screen itself.
2. A genuine N95 / FFP2 mask
Cabin air is filtered, but you're sitting 50cm from a stranger for ten hours. Even outside of any specific health concern, frequent flyers have long known that wearing a proper-fit mask on long-haul flights significantly reduces the “post-flight cold”. The flimsy disposable masks airlines hand out are surgical-grade and do almost nothing for inhalation; an N95 or FFP2 mask actually filters what reaches you.
3. A small bottle of saline nasal spray
Cabin air is desert-dry — typically 10–20% humidity, compared with 40–60% in a normal room. The membranes in your nose dry out, which is exactly when viruses and dust irritants find it easiest to settle. A 30ml bottle of saline spray (under the 100ml limit) used every couple of hours during the flight is one of the most under-rated travel-comfort hacks. It also helps with ear pressure during descent.
4. A real water bottle
You'll dehydrate on a long-haul flight whether you notice or not. Cabin crew run the drinks trolley twice and serve about 200ml at a time — nowhere near what your body actually needs. A collapsible 1-litre bottle, filled at the water fountain after security, means you don't have to wait for the trolley or push the call button. Aluminium bottles weigh nothing and survive being checked.
5. Compression socks (even on short long-hauls)
A pair of medical-grade compression socks costs around £15 and meaningfully reduces the risk of deep-vein thrombosis on flights over four hours. They also stop your feet swelling so much that your shoes feel a size too small on arrival. Put them on before takeoff and forget about them; airport security has zero opinion on them.
6. A power bank under 100Wh, with the spec printed clearly
A 20,000mAh power bank is typically around 74Wh — well under the 100Wh cabin limit. The trouble is that some cheap power banks don't print the watt-hour rating on the case, and gate agents in 2026 are increasingly checking. Either bring one with the rating clearly printed (Anker, Mophie, Belkin and similar do this), or carry the product page on your phone as backup. If you can't prove the rating, it can be confiscated.
7. An eye mask that doesn't press on your eyelashes
The airline-issued eye mask is, optimistically, terrible. A contoured eye mask — the type with two raised cups so it doesn't press on your lashes — costs around £10 and turns the difference between three hours of fitful dozing and six hours of actual sleep. Combined with foam earplugs (better than noise-cancelling headphones for sleeping because they don't hurt your ears when you lie sideways), it's the closest thing to a private cabin you'll get in economy.
8. One physical copy of your travel documents
A single sheet of paper with a printed copy of your passport photo page, e-visa (if applicable), travel insurance policy number and emergency contact. If your phone dies, gets stolen or refuses to download your boarding pass at exactly the wrong moment, this is what gets you through the gate. Fold it small, put it in a different pocket from your phone, and forget about it until you need it.
9. A small, multi-country plug adapter
The mistake is buying the giant rotating “world adapter” that takes up half your bag and works with everything badly. A smaller adapter that covers your specific destination's plug type is enough for nearly any trip — see our power adapter guide for which plug you actually need for each country. Pack it in your carry-on, not your hold bag, so you can charge during a layover.
10. A pen that writes upside down
Sounds trivial. Then your seat-mate asks if you have a pen for the landing card, you don't, the cabin crew don't either, and you spend the descent silently regretting your life choices. A Fisher Space Pen or a generic pressurised pen costs £8 and lives in your bag forever. It also doesn't leak at altitude — which the cheap ballpoint in your wallet will.
Pro tip
Pack carry-on essentials in a small zippered pouch — a 20cm × 12cm one is plenty. When you sit down on the plane, you take the pouch out and put the bag in the overhead. Everything you need for ten hours is at your feet; you never need to disturb your neighbour to retrieve the bag.
What to leave at home
The corollary list is just as important. These show up in “essentials” articles every year but rarely earn their place:
- Travel pillows — the U-shaped ones don't work for most people and bulk out a bag. A folded hoodie does the same job.
- Travel-sized toiletries you'll only use once — buy a small toothpaste at the destination; that's how the rest of the world manages.
- Books — an e-reader holds hundreds, weighs less and doesn't lose your page when you doze off.
- Camera bodies for casual trips — modern phone cameras (especially anything from the last two years) are good enough for everything short of professional work, and one less device to charge is one less point of failure.
- That “just in case” second outfit in your hand luggage — unless your checked bag is going onto a separate flight, the overwhelming odds are you won't need it.
Putting it together
The best carry-on bag is the one you don't notice until the moment you need it. None of the items above are expensive; together they make the difference between landing wrecked and landing ready. The full list, organised by trip type with progress tracking, lives in our packing list tool. For more detail on every category — documents, clothing, tech, health — see the complete travel packing guide.