What size backpack can be a carry-on?

Your backpack will generally be allowed as a carry-on if it's under 50 liters, or about 22 x 14 x 9 inches. Get a 45-liter backpack if you want to carry as much stuff as possible on the plane with you. All Knack Packs are carry-on friendly (under 50 liters).



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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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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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Oversized Carry-Ons Need to Be Checked-in
Usually, the fee is identical to purchasing a checked bag at the airport (if it isn't already included in your ticket).

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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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In summary, backpacks can be used as personal items, but they must fit in the plane's cabin. In addition, when airlines publish size limitations, your rucksack must be less than those limits.

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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. A carry-on is a type of hand luggage that you bring into the plane cabin with you and is larger than a personal item.

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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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It is rare for airlines to weigh your carry on or hand luggage. So long as your bag is not clearly overweight, and you're able to carry it with ease – you shouldn't have any issues with a slightly overweight bag.

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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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Oversized Carry-Ons Need to Be Checked-in
If your carry-on is oversized (and doesn't physically fit inside the overhead compartments) or you encounter a strict airline employee, they will ask you to check it in at the gate.

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The answer is yes. You can use a duffel bag as a carry-on item. However, you should ensure that the duffel bag's size and weight meet the airline's specific restrictions on carry-on luggage. You should also consider the bag's shape, as some airlines have limitations that may affect your duffel bag's usability.

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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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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.

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Technically, any piece of luggage that you “carry on” to an airplane is a carry-on bag. Most airlines allow one piece of carry-on luggage or “hand baggage” that can fit in the overhead bin, plus a “personal item” (a smaller purse, computer bag, diaper bag, small backpack, etc.

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Toothpaste is considered a liquid by the TSA (Transport Security Agency), even though it's technically a paste. In fact, all pastes, gels, waxes, and lotions are also classified as liquids. And even today, these substances are still restricted by the 3-1-1 rule in hand luggage due to safety threats.

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Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.

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You can pack tweezers in hand or checked baggage without any packing restrictions. But TSA doesn't allow packing sharp objects in hand baggage because some of them could be used as potential weapons. So some special types of tweezers might be prohibited if they have sharp, pointy ends.

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Carry-on bags are limited to 22 inches long, 14 inches wide and 9 inches high including wheels and handles. All three measurements shouldn't add up to more than 45 inches. For personal items, Alaska offers examples of a purse, laptop or briefcase.

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Are cabin bags weighed? They can be, but more often they are size-checked. We recommend that you ensure your bag is within the weight and size limits the airline specifies if you want it on board with you. If the staff deem your bag too big or too heavy, it will be checked.

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You can bring one carry-on bag and one personal item for free on most domestic and international flights. But there are a few rules you'll need to follow.

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