Guides to packing for a flight
12 guides to the rules behind airport security: liquids, batteries, power banks, prohibited items, food and medication. Every rule links to its official source.
All guides
Can I bring a power bank on a plane? Rules for 2026
Power banks go in carry-on only: up to 100 Wh is fine, 101–160 Wh needs airline approval. Plus the 2026 two-power-bank rule and airline in-flight bans.
How many ounces can you take on a plane? The TSA liquids rule
Carry-on liquids must be 3.4 oz (100 ml) or less per container in one quart-size bag. What counts as a liquid, exemptions and checked-bag limits.
What can't you bring on a plane? Prohibited items by category
Items not allowed on a plane, sorted by rule: carry-on bans like knives and bats, checked-bag bans like power banks, and items banned from every bag.
mAh to Wh: what a watt-hour is and how to convert
Convert mAh to Wh: multiply mAh by voltage, divide by 1,000. 10,000 mAh at 3.7 V is 37 Wh. Worked examples, a conversion table and why airlines use Wh.
Lithium batteries on planes: carry-on and checked bag rules
Spare lithium batteries go in carry-on only; installed ones can be checked if the device is off. Wh and 2 g limits, AA batteries, vapes and smart bags.
What can't go in checked luggage? Carry-on-only items explained
Power banks, spare lithium batteries, vapes and lighters must fly in the cabin. Why, the limits, laptop rules and what to do if your bag is gate-checked.
TSA approved toiletry bag: what the quart-size rule really requires
There's no official TSA approved toiletry bag. Here's what the quart-size rule requires, bag dimensions, how to pack it and what can go outside it.
Airline approved power banks: what actually makes one flyable
No power bank is officially airline or TSA approved. What lets one fly: 100 Wh or less, a clear label, carry-on only, no damage, and the 2026 count limits.
The 100ml liquid rule by country: UK, EU, Canada and more
The 100ml liquid rule by country: UK and EU airports that allow 2 litres, plus Canada, Australia, NZ, Singapore, Japan and the US, as of October 2026.
Flying with medication: TSA rules and international limits
Pills fly in any amount; liquid medicine over 3.4 oz is allowed if declared. Plus insulin, inhalers, EpiPens, CPAPs and Japan and Singapore import limits.
Can you bring food on international flights? Security vs customs
Security limits only liquid foods; customs decides what can enter. Rules on declaring food in the US, Canada, UK, EU, Australia, New Zealand and Japan.
Carry-on packing list: a TSA-friendly checklist by bag area
A carry-on packing list by bag area: liquids bag, electronics, medication, documents, food and small sharp items, with what to move to your checked bag.