Typically, most major airlines don't have a specified maximum weight for personal items. Just as long as it fits underneath the seat in front of you, it should be good to go.
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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.
In general, your personal item should be smaller than your carry-on and under the specific airline's carry-on dimensions, allowing it to fit under the seat in front of you. In most cases, backpacks are considered personal items as long as they fit under the seat in front of you.
Airlines may sometimes ask you to buy a new seat in order to fit your big item. Then, the additional fee will be significant. Even worse, if your personal item is too large or heavy, it is possible that you have to leave it or be denied entry.
Your personal item like a purse or small handbag must fit under the seat in front of you. Dimensions should not exceed 18 x 14 x 8 inches (45 x 35 x 20 cm). These don't count as your personal item or carry-on: Diaper bags (1 per child)
While some airlines specify size limitations for personal items, others simply require the item to be small enough to fit underneath the seat in front of you. For personal items, here's the standard size on major airlines in the United States: American Airlines – 18” x 14” x 8”
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.
The main difference between a carry-on and personal item is the size: Personal item - typical max size 18 x 14 x 8 inches or 45 x 35 x 29 cm + has to fit under the seat in front.Carry-on - typical max size 22 x 14 x 9 inches or 56 x 36 x 23 cm.
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).
What is considered a personal item bag varies from airline to airline, but a small purse, briefcase and laptop bag are always considered personal items. 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.
Standard and TSA PreCheck® ScreeningAs you know, standard screening requires that you remove all items and place them on the X-ray belt for screening. With TSA PreCheck®, you are able to speed through security and don't need to remove your shoes, laptops, liquids, belts and light jackets.
Most airlines allow passengers to bring on both a carry-on and a personal item like a backpack, laptop bag, purse, briefcase, shopping bag, etc. The general rule of thumb is that your personal item is smaller in dimension than your carry-on bag and it can fit underneath the seat in front of you.
So, yes, if your backpack is small enough that you can fit it under the seat in front of you, then it's a personal item. This designation becomes especially important when you're flying on a low-cost carrier or have booked a basic economy ticket on a larger airline.
Generally, you're allowed one carry on and one personal item, such as a purse, suit bag, briefcase. As long as your backpacks conform to the airline size specifications for hand luggage, it's not a problem that both your carry-ons are backpacks.
Size and Weight RestrictionsTypically, 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. Any bag within this dimension can fit most aeroplanes' overhead compartments.