What is a clamshell opening backpack?

It's essentially a soft suitcase built with straps for carrying on your back. What is this? Front loading backpacks are also often called clamshell backpacks because how they open mimics a clam.



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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.

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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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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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40L is perfectly within the size limits for carry on as long as it has the correct dimensions. Many bags, even 40L bags, don't however.

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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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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 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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? Flight Approved Carry on Backpack: Size of travel backpack: 20.47 x 12.99 x 8.66 . Capacity: 35L. This luggage backpack is meet the allowed maximum size of most IATA flights and also fits in the overhead compartment and the underseat in flight.

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Capacity: 35L. This luggage backpack is meet the allowed maximum size of most IATA flights and also fits in the overhead compartment and the underseat in flight.

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Carry-on Luggage Size Matters Generally, most of the European airlines limit carry-on luggage to a maximum size of 55 x 40 x 20 cm ( 21.6 x 15.7 x 7.8 in); however, a few airlines do accept bags up to 25 cm wide (9.84 inc) or do not accept more than 35cm tall (13.7 in).

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Some airlines also publish weight limits. 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.

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MEDIUM BACKPACKS (20 – 35L) This capacity range is considered a medium-size backpack and is probably the most popular bag capacity out there. It's great for taking to school or work, depending on the styling, and can also be a great travel pack for taking on a plane.

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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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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.

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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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For a 2-month trip through SEA, I'd personally recommend a 40L backpack. It's a good balance between carry-on size and having enough space for all your stuff. Plus, it's versatile enough to use for day hikes as well as leaving at hostels/hotels.

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