Can you bring a backpack for free?

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.



Whether a backpack is free on a flight in 2026 depends entirely on its size and your "High-Fidelity" fare class. On almost all airlines, including "Ultra-Low-Cost Carriers" (ULCCs) like Spirit, Frontier, and Ryanair, you can bring one small backpack for free, provided it qualifies as a "Personal Item." This typically means it must not exceed 18 x 14 x 8 inches and must be small enough to fit completely under the seat in front of you. However, if your backpack is a large "High-Fidelity" hiking pack or a standard-sized carry-on bag, it will only be free on full-service carriers like Delta, United, or American (unless you are in Basic Economy). For 2026 travelers, it is a high-fidelity requirement to check the "sizer" at the gate; if your overstuffed backpack doesn't fit in the "Personal Item" box, you may be charged a high-fidelity fee of $60 to $100 on the spot, making it a high-fidelity necessity to measure your bag before heading to the airport.

People Also Ask

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.

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What size backpack can you carry-on UK? 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. Any bag within this dimension can fit most aeroplanes' overhead compartments.

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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.

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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.

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Dimensions for carry-ons vary by airline, but a good rule of thumb is that any backpack less than 45 liters should fit most airlines (but be careful with ultra-budget airlines — especially in Europe). Any bigger than that, and you risk extra charges.

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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.

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American Airlines
According to airline policy, any personal items stowed beneath seats should not exceed 18 inches by 14 inches by 8 inches.

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A bumbag/fanny pack is an accessory, like a backpack or a lady's purse/handbag, and you should be prepared for it to be treated as such. That said, Mrs DC8 always wears a bumbag when travelling and it has never been an issue on any airline including the likes of Ryanair and Easyjet.

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Small personal item
Ryanair gives examples of a 'handbag, laptop bag or small backpack'. The airline states it cannot be larger than 40 x 20 x 25 centimeters (15.7 x 7.9 x 9.8 inches), but there is no weight limit. It should be stored under the seat in front of you.

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Famously quipped “the Ryanair size”, 40 x 20 x 25 cm (16 x 8 x 10 in) is the maximum dimensions of a cabin bag (such as a laptop bag or handbag) that ultra-cheap airline Ryanair would allow its passengers to carry into its cabin free of charge under its strict baggage allowance policy.

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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.

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Volume: A 45L backpack is the maximum-sized carry on allowed on most US airlines. For international or budget airlines, choose a bag under 40L. If you want to pack ultralight, anything 35L or under can be carried on virtually any airline. Dimensions: The common 45L volume is usually measured as 22 x 14 x 9 inches.

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While most backpacks, purses, and briefcases can pass as personal items, a large camping backpack probably won't fit under the airplane seat. Most airlines publish specific measurements for what counts as a personal item.

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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.

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As a general rule of thumb, anything smaller than the dimensions of a carry-on can be considered a personal item. However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches.

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If your small bag or 10kg cabin bag does not fit in the baggage sizers, which are placed at every boarding gate, we will tag your bag and place it in the aircraft hold subject to payment of a gate bag fee.

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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”

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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.

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Certainly, you can pack clothes in your personal items or carry-on bag. But for a better experience, we recommend packing most of your clothes in your carry on and leaving extra space in your personal items.

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