Empty metal containers with lids are generally allowed in carry-on and checked-luggage, but if it has the stink of something restricted -- flammable liquids for example -- then that may be another story.
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Firearms and ammunition, as well as any replicas or imitations. Explosives and flammable items, such as fireworks, gas, and aerosols. Poisonous and toxic substances, including pesticides and certain chemicals. Lithium batteries and other hazardous materials, as these can pose a safety risk if not handled properly.
For example, TSA guidance is very clear: If prohibited items are found during security checks, they won't be returned to their owners. That may vary in other countries, but the general rule is that confiscations are permanent.
Checked LuggageThere is normally a maximum weight limit of 50 pounds per checked bag as well as a size restriction. The most common maximum size bag allowed is 62 linear (total) inches. A common size bag for checking through is: 27 x 21 x 14.
Aluminum foil is generally allowed in both your carry-on and checked luggage. However, large or unusually shaped items wrapped in foil may cause an alarm in the security screening process and might require additional inspection.
Corrosives such as acids, alkalis, mercury and wet cell batteries and apparatus containing mercury. Explosives, munitions, fireworks and flares, ammunition including blank cartridges, handguns, fire works, pistol caps.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.
Here are some signs that the Department of Homeland Security says may indicate you've been flagged for additional scrutiny: You were not able to print a boarding pass from an airline ticketing kiosk or from the internet. You were denied or delayed boarding.
Toothpaste is considered a liquid by the TSA (Transport Security Agency), even though it's technically a paste. In fact, all pastes, gels, waxes, and lotions are also classified as liquids. And even today, these substances are still restricted by the 3-1-1 rule in hand luggage due to safety threats.