The rule of thumb for maximum size for carry-on is 40L with some 45L also meeting the requirements. Bags that are 55L with 15L day bag are also good since the day bag is used as a personal item making the 55L into a 40L for the overhead.
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Everything I've read on Reddit says anything over 40L absolutely won't pass as a carryon.
Bottom Line. Is a backpack a carry on? In many cases, as long as it's not larger than about 55L, yes, you can use many backpacking backpacks as a carry on. Or, if you want to check extra gear like tent stakes and trekking poles, check it all.
The Farpoint 55 comes with a fully detachable dayback that gives you ultimate flexibility with your travels. Plus, it meets most domestic carry-on requirements with the main pack overhead and daypack as your personal item for far-flung adventures.
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.
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.
Can a 60L backpack be a carry on? Yes, a 60L backpack can be taken as a carry on. But since it is a larger bag, you will most likely have to pay extra depending on the airline. As there is a limit on the size of your free carry-on baggage.
30-50 liters: In general, luggage that has a capacity of about 50 liters or less is sufficient for a weekend trip. There are lots of carry-on duffels, packs and bags in this size range to choose from. 50-75 liters: For a trip that lasts one to two weeks, many people jump up to a bag in this range.
But, based on my own experience, 70L is too large for a carry-on item with most airlines. If you're looking for the optimal balance between the largest bag possible, and the most airlines it would be allowed on, I find that 35L (53x35x20-cm) is allowed on 155 of the 175 airlines I could find data for.
The extra weight can distort the natural curve of the middle and lower back, causing muscle strain. Members of the UI Hospitals & Clinics Rehabilitation Services team recommend you carry no more than ten percent of your weight in a backpack.
Ultimately, most 40L or 45L duffel bags will fit as carry-ons, especially the ones (like a duffel bag!) that are soft enough to shift shape slightly. You'll need a very soft, squishy duffel or a small backpack if you plan to use a duffel as an under-the-seat bag.
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.
This is why most new backpackers think they need a larger backpack to travel, but with some clever organising and good packing cubes, a 40L backpack could just be the perfect size. You'll be incredibly surprised at just how small of a space you can fit everything you need for 3, 6 or even 12 months.
TSA Guidelines for Checkpoint Friendly BagsIn a nutshell, the current requirements are as follows: Your laptop bag has a designated laptop-only section that you can lay flat on the X-ray belt. There are no metal snaps, zippers, or buckles inside, underneath, or on top of the laptop-only section.
Most Airlines Don't Care if Your Carry-On Is 1 Inch Too Big. Carry-ons are measured at the airport before boarding the plane. It's done with metal measuring boxes just in the right size for the allowed carry-on dimensions. If your bag is too large and it isn't flexible, you won't be able to fit it inside.