The standard domestic carry-on luggage size is 22 x 14 x 9.” Anything below that is likely considered a personal item, but you should check with your airline to ensure you can bring a backpack as a personal item if you plan on having a carry-on.
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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.
While personal item size restrictions vary across airlines, most airlines consider a small backpack, purse, briefcase, or laptop bag to be a personal item. These must always fit under the seat in front of you. Many airlines restrict passengers to one personal item and one carry on bag.
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.
If your carry-on is too big, you will either have to pay penalty fees or check your luggage. Checking your luggage means that your carry-on won't be traveling with you but will instead be sent to the airplane cargo, and you will be able to claim it once the plane lands.
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 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.
You can, in general, bring one carry on and one personal item with you onto the plane. The exceptions to this rule are the basic economy fares now offered by both major and budget airlines. Basic economy fares are typically cheaper but only include one personal item. You'll have to pay extra for your carry on .
Their dimensions also often fall under the maximum carry on requirements for peace of mind when traveling light. We recommend using a 30 liter backpack carry on as its often just the right size for airline bag requirements.
Anything around the 40-45 liter mark should still be carry-on compliant depending on the dimensions and the airline. They make for great travel bags where you don't want to check in luggage. Even if you're a heavy packer, you should be able to take a 45L pack away for a weekend.
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 extra weight can distort the natural curve of the middle and lower back, causing muscle strain. Members of the UI Hospitals & Clinics Rehabilitation Services team recommend you carry no more than ten percent of your weight in a backpack.
You might develop lower and upper back pain and strain your shoulders and neck. Tight, narrow straps that dig into your shoulders can cause tingling, numbness, and weakness in your arms and hands.
Most airlines will base their size limits on the total size of your bag, not just the weight in pounds like checked bags. Some airlines only give a guidance on “linear inches,” i.e. the sum of the length + width + depth of your bag. A limit of 40 linear inches could also be expressed as 18 x 14 x 8 inches.
The main reason they don't scrutinize weight for carry-on bags is that they don't need to. Per Skift: When engineers design a plane, they make intricate calculations about the weight of passengers and the bags that they may bring on board….
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.