If your carry-on is 1-2 inches over the size limit, don't stress about it too much. Most likely, you'll be allowed to pass through without anyone saying anything. But be prepared that if you encounter a strict airline employee, you might have to check it in.
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A personal item is any type of luggage that fits underneath the plane seat in front of you. Most domestic airlines in the United States require a personal item to be 18” x 14” x 8” or smaller in size. Personal items can include a purse, briefcase, small backpack, laptop bag, weekender or small duffel bag.
The most common personal item size limit is 18 x 14 x 8 inches (46 x 36 x 20 cm). If your backpacks or handbags don't exceed this number, you're good. Weight limitations for personal belongings are also regulated by several airlines ranging from 10 to 25 pounds (around 4.5 to 11 kg).
If your carry-on is oversized (and doesn't physically fit inside the overhead compartments) or you encounter a strict airline employee, they will ask you to check it in at the gate.
However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches. You should confirm with the airline to avoid penalty fees if your personal item is too large.
The short answer is yes, the TSA is strict about carry-on size. They have specific guidelines for a reason and their agents are trained to enforce them. However, it's important to note that there is some leeway and flexibility within these guidelines.
The only time this might be worth the risk is if your personal item is only an inch or so bigger than that of the limits stated, and is soft-sided. At least if it's only slightly bigger, you should still be able to pad it down and demonstrate it fits in the sizer if required to.
A personal item is any type of luggage that fits underneath the plane seat in front of you. Most domestic airlines in the United States require a personal item to be 18” x 14” x 8” or smaller in size. Personal items can include a purse, briefcase, small backpack, laptop bag, weekender or small duffel bag.
Backpacks, totes, and crossbody bags are typically considered personal items too. The key to remember is it must be able to fit underneath the seat in front of you.
In general, travelers are permitted to bring into the plane one personal item and one carry-on bag with them on most flights. The personal item is often a small bag, such as a handbag or laptop bag, that is able to be stowed away beneath the seat that is directly in front of you.
In general, standard domestic carry-on luggage size is 22 x 14 x 9 inches. If you're flying internationally, that may vary a little to 21.5 x 15.5 x 9 inches. Remember, those dimensions include the handle, wheels and anything else that may protrude from your suitcase so don't miss them from your measurements.
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.
Most airlines allow backpacks as carry-ons, but size and weight restrictions vary depending on the carrier. Typically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on.
A good rule of thumb is that if your carry-on bag fits under the seat in front of you, it's considered a personal item. This includes small backpacks, purses, briefcases, laptop bags, etc. Larger bags, including suitcases, must fit in the overhead bin compartment.