Portable chargers must always be in your carry on bag. They can overheat starting fires and airline don't want that happening in the baggage hold.
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Do not pack you portable charger (power pack) in hold luggage: Taking your portable phone charger (power pack) on a plane is fine, but just remember to pack it in your hand luggage. Do not put them in your hold luggage as this is not permitted and could result in your luggage not being loaded.
These chargers or power banks are restricted to carry-on luggage only according to FAA and IATA guidelines. They're not allowed in checked luggage because of the risk of lithium batteries catching fire. In the cabin, such an event can be promptly handled, but in the hold, it could lead to dangerous situations.
This covers typical dry cell batteries and lithium metal and lithium ion batteries for consumer electronics (AA, AAA, C, D, button cell, camera batteries, laptop batteries, etc.) Spare (uninstalled) lithium metal and lithium ion batteries are always prohibited in checked baggage and must be placed in carry-on.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.
Airlines typically limit power chargers to batteries with 100-watt hours (Wh), although you can pack batteries capable of 160 Wh if you get preapproval from the airline. The 100Wh limit covers standard electronics such as smartphones, tablets, laptops, and headphones.
Explosives and flammable items such as fireworks, dynamite, and gasoline can pose an extreme safety risk to passengers and the aeroplane. Weapons and firearms, including guns, replicas, and ammunition, are prohibited in checked luggage to prevent any potential threat to the safety and security of passengers and crew.
Pack large electronics on top layer of carry-on for screening accessibility. Place your 3-1-1 bag with liquids, gels and aerosols in the front pocket of your carry-on for accessibility.
As a guide, anything larger than A5 size or an iPad mini needs to be placed in a tray with nothing covering it up. If you can spray, spread or pour something at room temperature, it counts as a liquid in aviation security terms. This includes aerosols such as asthma inhalers and foodstuffs, like butter or jam.
Don't wear shoes with steel tips, steel heels, steel shanks, metal buckles, or nails. Tennis shoes are usually a safe bet. If you know that your shoes set off the alarm on the metal detector, wear something else while flying. Shoes in your carry-on luggage might also be a problem.
Tip #2: Reduce waste and save some money by bringing a reusable water bottle. So you can't bring H20 or any other liquids more than 3.4 oz.(well there are some exceptions) through security, but you CAN bring an empty bottle. Just fill it up on your way to boarding your flight after screening.
Safety Razors: Because the razor blades are so easy to remove, safety razors are not permitted in your carry-on luggage with the blade. They're fine to pack in your carry-on without the blade. The blades must be stored in your checked luggage. The same applies for straight razors.
Solid food items (not liquids or gels) can be transported in either your carry-on or checked baggage. TSA officers may instruct travelers to separate items from carry-on bags such as foods, powders, and any materials that can clutter bags and obstruct clear images on the X-ray machine.
Any item that alarms or is unable to be screened will not be permitted in your carry-on bag. We recommend packing all liquids, gels, and aerosols that are over 3.4 oz or 100 ml in your checked baggage, even if they are in a secure, tamper-evident bag.
In general, the best things to pack in your checked luggage vs carry on are the bulkier, heavier items such as your clothes, shoes, toiletries, makeup and accessories. You can't board a flight with certain items, and these should be in your checked bag.
The TSA's liquid limit for carry-ons—known as the 3-1-1 rule—allows travelers to pack liquids, aerosols, gels, creams, and pastes under 3.4 ounces (100 milliliters) in their carry-on bags. Passengers are allowed up to one quart-sized bag per person, or roughly nine 3.4-ounce containers in a single quart-sized bag.