Personal items must not exceed 17 L (43.2 cm) x 13 W (33 cm) x 8 H (20.32 cm). Blue Basic fares include 1 personal item that fits under the seat in front of you, like a purse, daypack, laptop bag or pet carrier. Any additional or larger carry-on bags brought to the gate will incur a fee and need to be checked.
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Many airlines do not actually put a size limit on your personal item, only that it must fit underneath the seat in front of you. In fact, even the airlines that do have size limits say the same thing, your personal item always has to fit under the seat in front of you.
A backpack can be your carry on if it meets your airline's carry on size limits. A personal item is a smaller, secondary bag, which you'll stow under the seat in front of you. Read Carry Ons vs. Personal Items for more on the differences between the two.
Usually, many airlines won't check every carry-on but will instead go for ones that look oversized. If your luggage does not fit in the sizer, you might have to pay a checked bag fee along with the gate checking fee and have your bag transferred to the airplane's cargo.
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.
Personal items must not exceed 17 L (43.2 cm) x 13 W (33 cm) x 8 H (20.32 cm). Blue Basic fares include 1 personal item that fits under the seat in front of you, like a purse, daypack, laptop bag or pet carrier. Any additional or larger carry-on bags brought to the gate will incur a fee and need to be checked.
Domestic carry-on policies. 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.
Personal items should fit under the seat in front of you. Examples include laptop cases, purses, camera bags, diaper bags, small backpacks and duffels. Some airlines publish maximum dimensions for personal items. Most domestic airlines specify 22 inches by 14 inches by 9 inches as the maximum size for carry-on baggage.
The JetBlue Blue fare is the name for a regular economy seat on JetBlue planes. It's the lowest class of service you can book with TrueBlue points, but it comes with a free carry-on bag, free seat selection, and no fees for changes and cancellations.
Customers are prohibited from taking liquids, gels, and/or aerosols past the airport security screening checkpoint except: One clear transparent, resealable one-quart (one-liter) sized plastic bag containing liquids, gels, and aerosols in travel size containers (3.4 oz./100 ml capacity) or less per container.
The short answer: Yes, a backpack is generally considered a personal item if it fits under the seat in front of you. Most airlines offer a few examples of things that fit into the “personal item” category, such as a purse, laptop bag, or a briefcase, but they don't usually include “backpack” on those lists.
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.
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.
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.
How strict are the airlines about luggage dimensions? Carryon dimensions are limited to the size of the overhead bin. In those cases dimensions are strict. Anything too big gets gate checked.
If the baggage size, be it check in bag or cabin bag, is higher than usual, you may need to pay additional sum if required. If the baggage is too big or too heavy, the airline may send it separately by cargo plane. You may need to pay additional sum if required.