YUCTS Tools

Carry-on & Checked Baggage Restrictions (Power Banks, Liquids, Knives and more)

See whether power banks (two per passenger since 2026), 100 ml liquids, e-cigarettes, lighters, knives and more can go in the cabin or in checked bags, from Japan, Taiwan, US and ICAO rules with sources.

  • Runs in your browser with cited reference data

Japan → Taiwan: international flight

Rules at connecting airports and in the destination country may also apply. The ICAO baseline for international flights is shown too.

Reference information on frequently asked items, summarized from rules published by national authorities (checked 2026-11-06). It does not guarantee that you will pass security screening. Some countries and airlines have stricter rules, and the final decision is made by security officers and the airline.

Result

Notes for your destination

Watt-hours of a power bank or battery

Wh = mAh × V ÷ 1000. If the battery shows a Wh rating, that value prevails. Use the cell’s rated voltage (for example 3.7 V).

Watt-hour rating
37 Wh
Up to 100 Wh: allowed in the cabin under most rules (power banks and spare batteries cannot be checked).

How to use

  1. Choose the departure (where you go through security), the destination and an item.
  2. For each item you see whether it is allowed in carry-on and checked baggage, the conditions, source links and the check date. On international trips the ICAO baseline is shown too.
  3. Enter a power bank’s capacity (mAh) and voltage (V) to calculate its watt-hours and see whether it is within 100 Wh or 160 Wh.
  4. Use "Copy" to save the checklist, and check your airline’s latest information before you fly.

FAQ

How many power banks can I take?

ICAO limited power banks to two per passenger on 27 March 2026; Japan applies the limit from 24 April 2026 and Taiwan from 8 April 2026. FAA rules in the US set no quantity limit for most batteries, but airlines may limit them.

Does the 100 ml liquids rule apply to domestic flights?

In Japan and Taiwan the 100 ml rule covers international flights. In the US, the TSA rule applies to domestic flights as well.

If it says "Allowed" here, will I pass security?

Not necessarily. Countries and airlines can have stricter rules, and security officers and the airline make the final decision.

Notes & limitations

  • What you enter is processed only on this page and is not sent to YUCTS servers.
  • Reference information summarized from public pages of the Japanese, Taiwanese and US authorities and ICAO checked on 2026-11-06; it does not cover every item or country and does not guarantee that you will pass security screening.
  • Airline-specific rules (such as bans on using power banks on board), rules at connecting airports or in the destination country, and customs or quarantine rules are not included, apart from the few notes shown.
  • Watt-hours are calculated from the capacity (mAh) and voltage (V) you enter; a Wh rating printed on the battery prevails.
  • Rules change (for example the 2026 power bank rules). Check the source links for the latest information.

Data sources