Hand Luggage Rules, Explained Simply
Sizes, liquids, batteries and the things people are surprised to have confiscated, plus how to pack a carry-on that behaves.
7 min read
Hand luggage rules feel like trivia until you are at security watching someone surrender a jar of honey. Most of the rules are simple, a few are counter-intuitive, and airlines differ more than the security rules do.
Here is what actually matters.
Size and weight, which the airline decides
Security cares about what is in your bag. The airline cares about how big it is. These are two separate systems and only the second one changes between carriers.
Check the exact dimensions on your airline's site, including whether wheels and handles count. Budget airlines often sell two different cabin bag allowances: a small bag that fits under the seat, included, and a larger one that costs extra. Assuming you have the larger allowance when you do not is one of the most common expensive mistakes at the gate.
The liquids rule
The classic rule is containers of one hundred millilitres or less, all fitting inside a single transparent resealable bag of around one litre.
It is the container size that matters, not how full it is. A half empty two hundred millilitre bottle is not allowed. Some airports have new scanners that relax this, but the rules are not consistent yet, so pack to the strict standard.
Medication and baby milk are treated differently and are generally allowed in larger quantities. Declare them at the tray rather than hiding them in the bag.
- Toothpaste, sunscreen and yoghurt count as liquids
- Solid alternatives, like a shampoo bar, avoid the problem entirely
- Buy large toiletries at the destination instead of carrying them
- Duty free liquids stay sealed in their tamper evident bag
Batteries and electronics
Power banks and spare lithium batteries must travel in the cabin, never in checked luggage. This is a genuine safety rule and it is enforced.
Larger electronics may need to come out of the bag at security. Pack them near the top so you are not unpacking on the belt.
Things people are surprised about
Cutlery with a blade, small tools, scissors above a certain length, and anything that looks like a weapon in an x-ray, including some toys.
Food is mostly fine to carry through security but may not be allowed into your destination country. Fresh meat, dairy and plants are commonly restricted at borders even when they passed the departure scanner without comment.
Packing a carry-on that behaves
Pack in layers rather than piles. Clothes on the bottom, shoes along the hinge, electronics and liquids in a top layer you can lift out in one movement.
Keep documents, medication, phone, charger and a change of shirt in a small pouch you can grab without opening the whole bag. That pouch is what makes a delay survivable.
Leave some space. Whatever you buy on the trip has to come back with you, and repacking a jammed bag on a hotel bed at six in the morning is nobody's idea of a holiday.
In short
Hand luggage is mostly common sense with two firm rules: liquids in small containers, batteries in the cabin.
Get those right, check your airline's dimensions once, and the rest of packing is just choosing what you actually need.
