How to pack electronics in a carry-on

Getting your electronics through airport security without a bag pull, a missed flight, or a confiscated power bank comes down to knowing a handful of firm rules and building one repeatable packing system.

Why lithium batteries are carry-on only

The FAA bans lithium-ion batteries in checked baggage when they are spare (not installed in a device). The risk is thermal runaway: a damaged or defective cell can ignite, and a fire in the cabin can be seen and suppressed; a fire in the cargo hold cannot. This is not a TSA preference, it is a federal aviation safety rule.

That means every power bank, every spare laptop battery, and every spare camera battery travels with you in the cabin. Installed batteries (the one inside your phone or laptop) are fine in either bag, but it still makes sense to keep those devices in your carry-on to avoid damage and theft.

How to read watt-hour ratings

Most power banks list capacity in milliamp-hours (mAh), not watt-hours (Wh). Airlines and the FAA use watt-hours. The conversion: multiply mAh by the battery voltage (usually 3.7V) and divide by 1,000.

A 20,000 mAh bank at 3.7V works out to 74 Wh, comfortably under 100 Wh, and even the 24,000 mAh Anker 737 PowerCore 24K lands around 87 Wh. A 26,800 mAh bank hits roughly 99 Wh, still fine without approval. Anything above 27,000 mAh starts pushing past 100 Wh and may require checking with your airline before you fly.

Getting through the checkpoint efficiently

The biggest source of delay at security is not the rules, it is not being ready to meet them. A few habits eliminate almost all checkpoint friction.

Protecting devices in transit

Airport bins are hard on gear. Cameras, laptops, and tablets get stacked and slid. A padded sleeve for your laptop and a rigid case like the Pelican Electronic Organizer or padded pouch for cameras adds meaningful protection without much weight.

For cables, a roll-up organizer or a zippered flat pouch prevents the tangle problem and makes every cable findable. Label both ends of less obvious cables (a small piece of tape and a pen works) if you travel with more than four or five.

For earbuds and headphones, a hard clamshell case matters more than most people realize. Headphone hinges and cables are fragile, and a soft bag in a packed carry-on provides almost no crush protection.

The organizer you can pull out in one motion at the checkpoint is the one that actually gets used.

Checked bag versus carry-on: what actually belongs where

Beyond the mandatory carry-on rules for batteries, most electronics belong in your carry-on for practical reasons: checked bags get lost, delayed, and handled roughly. Laptops, cameras, power banks, and anything irreplaceable should never go below the plane.

What can go in checked bags: heavy AC adapters and wall chargers (no lithium cells), USB hubs, and wired peripherals like a travel mouse. These are bulky, low-risk items that free up space in your carry-on.

One exception worth noting: if you are traveling internationally and using a voltage converter or power strip, check whether it contains any surge-protection circuitry with a lithium backup. A small number of smart power strips do, and those must come in the cabin.

Frequently asked questions

For specific picks to keep your cables and chargers organized, see our guide to the best electronics travel organizers. Browse all travel guides or read how we research and rate gear.