Traveling with a $2,500 laptop, a $400 camera, a professional microphone, and three lithium batteries is now the default, not the exception. Unfortunately, the rules governing those electronics have changed faster than most travelers realize. Here is the up-to-date 2026 guide to TSA, airline, and customs requirements — in plain English.
TSA carry-on electronics rules (United States, 2026)
- Laptops: Must be removed from the bag at standard security lanes. TSA PreCheck and Clear lanes still allow laptops to stay in the bag, provided the bag has a TSA-approved “checkpoint-friendly” sleeve.
- Tablets (iPad, Surface, large e-readers): Must come out only at standard lanes, and only when larger than 7 inches.
- Powders: Any powder container over 350 ml may require additional screening. Protein powder, loose-leaf tea, and cosmetic powder are the common traps.
- Lithium-ion batteries: Under 100 Wh — unlimited in carry-on, prohibited in checked luggage. 101–160 Wh — maximum two per passenger, airline approval required. Over 160 Wh — banned from passenger aircraft.
- E-cigarettes / vapes: Carry-on only, never checked.
- Smart bags: Bags with integrated batteries must allow battery removal, or the entire bag becomes checked luggage (and the battery still must come out).
Converting mAh to Wh (the math that trips people up)
Most power banks and camera batteries are labeled in mAh, but airline limits are in Wh. The formula:
Wh = (mAh × V) / 1000
A 20,000 mAh power bank at 3.7 V is 74 Wh — well under the 100 Wh limit. A 27,000 mAh power bank at 3.7 V is 99.9 Wh — borderline. A 30,000 mAh pack is 111 Wh, which requires airline approval on most carriers.
International airline variations
- EU carriers (Lufthansa, Air France, KLM, Iberia): Mirror the US 100/160 Wh rule, but require written airline approval for 101–160 Wh power banks.
- Middle East (Emirates, Qatar, Etihad): Additional restrictions on in-flight use of power banks above 20,000 mAh since mid-2025.
- Asia (Cathay, Singapore, Qantas): Ban on any use of power banks during flight if the bank is kept in the overhead bin. Must be under the seat in front of you.
- South America (LATAM, Avianca, Gol): Enforce the 100 Wh rule strictly on international routes; domestic Brazilian flights allow up to 160 Wh without approval.
Customs declarations (electronics specifically)
Brazil
The personal-use exemption is USD 1,000 by air (2026 figure). A single new-in-box MacBook Air exceeds that and is subject to 50% duty at the Receita Federal red channel. Pros carry devices already opened, with serial numbers registered, to argue personal use.
European Union
VAT is collected on goods exceeding €430 for air travelers. A €2,000 laptop attracts 20–25% VAT if you cannot prove you brought it in. Register it with EU customs (CN23 declaration) if you are a frequent business traveler.
India
One laptop per passenger is duty-free. A second laptop attracts ~38% duty. Declare at the red channel; undeclared second devices are routinely seized.
United States (returning residents)
The $800 personal exemption applies. New electronics bought abroad are declarable — the $2,000 Tokyo-purchased camera is not hidden from CBP's database.
Protective packing: what professionals do
- Dedicated padded laptop sleeve inside the bag. Not a third-party sleeve shoved into the main compartment. A bag with a true padded back panel protects against drop impacts.
- Crush-proof hard inserts for camera bodies — use small Peli cases or molded foam blocks.
- Separate the dongles. A clear zip pouch with labeled cables saves 5 minutes at every security checkpoint.
- Battery separation. Remove lithium batteries from devices before packing. TSA recommends storing spare batteries in original packaging or a battery case that prevents terminal contact.
- Cloud backup before travel. US CBP is allowed to inspect the contents of any electronic device at entry. Cloud-only files reduce your exposure.
Why bag design matters for electronics travelers
The LOUVT Expansible Travel Bag was built around the electronics traveler:
- Padded laptop pocket fits devices up to 15" flush against the back panel.
- Quick-access side pocket holds passport, boarding pass, and a small power bank, removable in one motion at security.
- Main compartment opens 180° at security so TSA can inspect without unpacking.
- Expansion gusset accommodates duty-free electronics on the return leg without requiring a second bag.
Final checklist before you fly
- All lithium batteries in carry-on, under 100 Wh, terminals insulated.
- Laptop accessible in under 5 seconds without unpacking.
- Power bank capacity in Wh written on the device (use a label-maker if needed).
- Customs receipts or photographs for high-value items you already own.
- Cloud backup completed within the last 24 hours.
For more, see our airline dimension guide or the trolley sleeve vs detachable wheels buyer's guide.