How big can your personal backpack be on United Airlines?

United Airlines Carry-On Baggage One full-sized carry-on bag 9 inches x 14 inches x 22 inches (22 cm x 35 cm x 56 cm) plus one personal item 9 inches x 10 inches x 17 inches (22 cm x 25 cm x 43 cm). If you are travelling on a Basic Economy ticket, your personal item will be the only item you can bring on board.



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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.

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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 advises customers to travel with personal items that are no larger than 18 inches x 14 inches x 8 inches. If you are flying on Delta, be sure your personal item is 17 inches x 13 inches x 9 inches or smaller.

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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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Size and Weight Restrictions 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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How Strict are Airlines About Personal Items? As long as your bag fits under the seat in front of you, you can probably get away with a bag that's slightly over your airline's size guidelines. However, just as the size restrictions vary by airline, so does their enforcement of those restrictions.

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You can travel with one personal item, like a shoulder bag, backpack, or laptop bag that fits under the seat in front of you.

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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.

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The Top Carry-on Backpacks for 2023
  • Best Overall: Cotopaxi Allpa 35L.
  • Best Budget: ZOMAKE Lightweight Packable Backpack 30L.
  • Best Lightweight: Osprey Farpoint 40.
  • Best for Business: Aer Travel Pack 3.
  • Best for International Travel: Solgaard Lifepack Endeavor (with closet) – Large.


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While these sizes vary by airline, a personal item will typically measure no more than 18 x 14 x 8 inches or 45 x 35 x 29 cm. If your bag does not fit within these dimensions, the airline will likely consider it your 'carry-on' bag and charge you accordingly.

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Yes, it is possible to take two backpacks as a carry-on on a plane. The airline would count each backpack as a separate carry-on bag, so be sure to check with your airline regarding their specific baggage restriction policies. Will a backpack fit under an airplane seat? That depends on the size of the backpack.

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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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You now know more about what you can and can't pack in a carry-on, but what about items you definitely should pack in your carry-on? First, we'd recommend packing a change of clothes, any medication you need to take with you, and any valuable items, just in case your checked luggage is lost by the airline.

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Solid food items (not liquids or gels) can be transported in either your carry-on or checked bags within the continental United States. Liquid or gel food items larger than 3.4 oz are not allowed in carry-on bags and should be placed in your checked bags if possible.

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