There is no simple traveler-wide allowance for every melatonin product, dose, and route.

Keep it in original packaging, carry a prescription or doctor note when applicable, bring only a personal-use amount, and check Customs plus transit-country rules.

Power banks belong in carry-on baggage and airline capacity limits apply.

Confirm the Wh rating is clearly marked, protect the terminals, and check both your international airline and any China domestic flight operator. Mainland domestic flights also require a clear CCC mark and reject recalled models or batches.

Rules depend on the active ingredient, quantity, documentation, and whether it is controlled.

Use original labeled packaging, carry the prescription and a doctor letter, verify the ingredient with China Customs or the nearest Chinese embassy, and declare it when required.

Fresh produce, meat, and other animal or plant products can fall under quarantine prohibitions or declaration rules.

Do not pack them without checking the current Customs quarantine list. Declare agricultural and animal products instead of guessing at arrival.

Sealed packaging alone does not make every food item admissible.

Check ingredients for meat, dairy, seeds, fresh produce, or other quarantined materials, keep the commercial label, and declare items when uncertain.

Airport screening, airline carriage, Customs entry, and a family or medical-food backup are separate decisions.

Keep the original label visible. Present only genuinely in-flight infant liquid dairy or necessary liquid medicine for security confirmation, check the operating carrier for the exact product, and use Goods to Declare when animal-product ingredients or entry status are unclear.

Airline battery rules, liquid limits, customs quantities, and local use restrictions may all apply.

Keep the device in carry-on baggage with accidental activation prevented, never use or charge it onboard, and confirm current customs and destination rules.

Carrying a drone, clearing baggage, and being allowed to fly it in China are separate decisions.

Check the operating airline's battery and baggage rules, then confirm official China registration, activation, aircraft-category, and airspace requirements before any outdoor flight. Do not assume a visitor or sub-250g drone is automatically permitted.

Airport carry-on limits, China domestic connections, duty-free transfers, airline baggage rules, and Customs checks are separate decisions.

Use clearly marked containers of 100 mL or less for an international carry-on liquid bag, keep larger permitted toiletries in checked baggage, and recheck each China domestic connection. Ask Customs about uncertain ingredients, quantities, or declarations.

Perfume and toiletry sprays are screened as liquids, while pressurised, flammable, or defensive sprays can face extra transport restrictions.

Check the exact label and ingredients, use a 100 mL-or-smaller container only where the carry-on liquid rule applies, and ask the operating airline about checked baggage. Do not pack pepper, tear-gas, animal-deterrent, or unknown sprays as travel toiletries.

Customs declaration, airline baggage, alcohol strength, and disinfectant ingredient rules are separate checks.

Check the label's alcohol percentage and active ingredient. Declare 1,500 mL or more of drinks at 12% alcohol by volume or above, check drinks as permitted, and do not pack alcohol disinfectant above 70% or hydrogen-peroxide disinfectant as baggage.

Personal electronics are usually practical travel items, but spare lithium batteries are cabin-only and airline Wh limits apply.

Keep the laptop with you when practical, shut it down fully if an airline permits it in checked baggage, and place each spare battery in a protective cabin-baggage pouch. Check the printed Wh rating and the operating airline before every flight.

A self-heating pack makes an otherwise ordinary meal an air-carriage issue; Customs entry for the remaining food is separate.

Do not pack a product that still contains its heating pack for carry-on or checked baggage. If the pack is genuinely removed, check the remaining food's ingredients, keep its label, bring only a personal-use amount, and declare animal or plant products or uncertainty.

Lighters, matches, and other ignition sources may not be carried or checked on a China flight.

Remove them from every pocket, carry-on, and checked bag before going to the airport. Do not treat a Customs declaration, a small size, or a domestic connection as a flight exception; check a non-air route separately with its responsible carrier and authority.

Fuel and pressurised gas are dangerous goods, not a carry-on-versus-checked-bag choice for a China flight.

Do not pack fuel, a gas canister, or a fuel bottle for any flight segment. Leave it outside the airport and ask a campsite, retailer, or responsible carrier about a lawful non-flight or post-arrival option.

Fireworks-effect items are prohibited in both carry-on and checked baggage on a China flight.

Remove fireworks, firecrackers, sparklers, party poppers, and similar items before going to the airport. A Customs declaration, small quantity, retail seal, or domestic connection is not a flight exception; check any non-air route or local event separately with its responsible authority or provider.

Seeds and other plant material capable of reproduction are a Customs and quarantine issue, not an ordinary baggage choice.

Do not pack them unless you have confirmed the exact item has the required official approval and quarantine certificate. If you are carrying an uncertain plant item, use the Goods to Declare channel; declaring it does not itself make it admissible.