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If you're planning on flying anywhere (work, vacation, family), then it's best to know the rules of carry on luggage. it's been a while since we've gone anywhere so let's get reacquainted with them.

Certain small tools, such as screwdrivers, wrenches, and pliers, are permitted, as long as they are 7 inches or less in length. 

Nearly all liquids (like beverages, contact lens solution, shampoo, makeup products, liquid medicine, nail polish, perfume/cologne, face toner); gels (like hair gel, toothpaste, hand sanitizer, face serum); and aerosols (products dispensed in a pressurized spray can or bottle, like hairspray, dry shampoo, or spray-on deodorant)—are allowed in your carry-on luggage. However, all liquid, gel, or aerosol items you carry on (including food and drink) must be in a 3.4-ounce or smaller container and fit together in one single, quart-size, clear, zippered plastic bag. 

Passengers may carry on common lighters and one book of safety matches—however, strike-anywhere matches are prohibited in both checked and carry-on luggage. No matches, including safety matches, are permitted in checked baggage.

You can pack dry batteries (AA, AAA, C, and D) in either carry-on or checked bags. 

Materials for knitting and needlepoint are allowed in carry-on bags and checked luggage. Make sure any knitting needles are wrapped or otherwise protected to prevent injuring luggage handlers and inspectors.

Wrapped presents can be carried on board, provided the contents meet safety and security regulations. 

Small, portable electronic items that are smaller than a standard-size laptop, such as cell phones and tablet devices, do not have to be removed from baggage during screening.

All prescription and over-the-counter medications can be carried on board the aircraft in unspecified quantities. Other medical necessities including but not limited to inhalers, EpiPens, canes, casts, blood-sugar test kits, crutches, liquid nutrition for passengers with a disability, and items used for medical or cosmetic reasons, such as mastectomy products, can also be packed in carry-on bags. These items must be declared to screeners before going through security and are subject to additional screening.

Both disposable and electric razors are allowed in either carry-on or checked luggage.

As long as the amount of e-liquid you're carrying onboard is less than 3.4 ounces, it is allowed through security—quantities larger than 3.4 ounces must be checked. However, battery-powered e-cigarettes, vaporizers, vape pens, atomizers, and electronic nicotine delivery systems can only be taken onboard the aircraft in your carry-on or on your person.