Hand Warmers and Heat Packs: Carry-on and Checked Baggage Rules Differ by Type
Whether a hand warmer can go in checked baggage or carry-on depends on how it generates heat. Disposable hand warmers that produce heat through a reaction between iron and oxygen are not on the Ministry of Land, Infrastructure and Transport's list of prohibited items, so you can pack them in both checked baggage and carry-on. Rechargeable hand warmers contain a built-in lithium battery, so they follow the same rules as portable battery packs and can't go in checked baggage. Oil-fueled portable hand warmers are banned from both the cabin and checked baggage under ANA's rules.
Disposable Iron Oxidation Hand Warmers: Allowed in Both Checked and Carry-on Baggage
The Ministry of Land, Infrastructure and Transport's official guidance page lists matches, lighters, and butane gas under flammable materials, and states that passengers can carry one small box of safety matches and one portable lighter per person in the cabin. This list covers only flammable materials such as matches, lighters, and butane gas. Disposable hand warmers that generate heat through an iron oxidation reaction fall into a separate category.
A pack of two pocket heat packs sold by Daiso Mall costs 1,000 won. The product page states the packs reach a maximum of 75 degrees Celsius, average 63 degrees, and hold that temperature for 14 hours. They generate heat purely through iron oxidation, with no battery or liquid fuel.
Taiwan sells products that work on the same principle. The product page for the adhesive warming pack (黏貼式暖暖包) on the momo shopping site states the pack lasts 15 hours and has passed SGS testing. Since this item doesn't appear on any hazardous materials list, you can pack it in both checked and carry-on baggage like ordinary luggage.
Rechargeable Hand Warmers: Banned from Checked Baggage, Same Rules as Portable Battery Packs
Asiana Airlines' official restricted items page states that transport is banned outright for lithium-ion batteries exceeding 160Wh or containing more than 8g of lithium metal.
Cathay Pacific's official lithium battery guidance page breaks the limits down further. Batteries of 100Wh or less can be carried in the cabin without restriction. Batteries over 100Wh and up to 160Wh can be carried in the cabin, up to two per person, with airline approval. Rechargeable hand warmers fall under the same thresholds based on their built-in battery capacity.
Like portable battery packs, rechargeable hand warmers can't go in checked baggage and can only be carried in the cabin.
Taiwan's Taoyuan International Airport applies the same thresholds to products with built-in lithium batteries. According to a news report citing the airport's official regulations, batteries of 100Wh or less can be carried straight into the cabin, batteries over 100Wh and up to 160Wh require airline consent, and batteries exceeding 160Wh are banned from the cabin entirely.
Oil-Fueled Portable Hand Warmers: Banned from Both Cabin and Checked Baggage in Japan
ANA's official guidance page classifies oil-filled portable hand warmers as flammable liquid hazardous materials. The page explains that the fuel system works similarly to an oil lighter, which soaks oil into cotton wadding, and states that for this reason the item is banned from both carry-on and checked baggage.
The same page states that only one cigarette lighter per passenger is allowed in the cabin as a statutory exception. Oil-fueled hand warmers don't qualify for this exception.
Heat-Generating Electronic Devices With Non-Removable Batteries: Banned on All Routes by Korean Airlines
According to a Herald Economy report from January 15, 2026, major Korean airlines including Asiana Airlines have banned heat-generating electronic devices with built-in batteries, such as hair straighteners, irons, and electric hand warmers, from carry-on baggage on all routes since September 2025.
The same report states that these devices also can't go in checked baggage. The only exceptions allowed in the cabin are devices with removable batteries or devices that support airplane mode.
Summary by Type
| Type | Carry-on | Checked Baggage | Source |
|---|---|---|---|
| Disposable iron oxidation (adhesive or non-adhesive) | Allowed | Allowed | Ministry of Land, Infrastructure and Transport prohibited items guidance |
| Rechargeable (built-in lithium battery, 160Wh or less) | Allowed (conditions by threshold) | Banned | Asiana Airlines, Cathay Pacific official guidance |
| Oil-fueled (e.g. Hakkin Kairo) | Banned | Banned | ANA official guidance |
| Heat-generating electronic devices with non-removable batteries | Banned | Banned | Herald Economy report, January 15, 2026 |
Sources: ANA Carry-on and Checked Baggage Restrictions Guidance
Sources: Asiana Airlines Restricted Items
Sources: Cathay Pacific Lithium Battery Guidance
Sources: News Report on Taoyuan International Airport Lithium Battery Carry-on Rules
Sources: Daiso Mall Pocket Heat Pack, Pack of 2, Product Page
Sources: momo Shopping Site, Adhesive Warming Pack (黏貼式暖暖包) Product Page