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Thermos/insulated beverage container (empty): You may bring an empty thermos bottle or other insulated beverage container in your carry-on baggage.
Thermometer containing mercury: Permitted in carry-on baggage only if carried by a representative from a government weather bureau or similar official agency. May be permitted in checked baggage if approved by air carrier.
Thermometer without mercury (used for cooking or medical reasons): This item is permitted in both carry-on and checked baggage.
Tools: Small tools with a head and shaft measuring 6 cm (2.4 in.) or less (measured from the joint to the tip) are permitted in carry-on.
See How to Measure Sharp Objects for further detail.
Tools for mobility aid reassembly/disassembly: Permitted in both carry-on and checked baggage.
Toothpaste: 100 ml (3.4 oz.) or smaller container permitted in carry-on.
Tooth powder: Certain powders and granular materials in your carry-on are limited to a total quantity of 350 ml or less (roughly the size of a soda can). There are no exemptions for medical reasons.