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.
All bags from 30L-45L meet TSA carry-on regulations for all commercial flights. The 60L duffel meets TSA carry-on regulations for most commercial flights.
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.
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.
Most airlines will charge extra to take larger backpacks on as carry on luggage. 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.
Yes.The usual maximum dimensions for carry-on luggage are 9 inches x 14 inches x 22 inches (22 centimeters x 35 centimeters x 56 centimeters). This is 43.12L, so your 50L backpack is about 16% too big. You might get away with it because the gate staff often doesn't (have the time to) check the bag sizes in all detail.
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.
What is this? Ryanair say the size of the free small carry-on bag is 40 x 20 x 25cm and can be a maximum of just 20 litres and I quote from their website 'must be able to fit under the seat in front of you.
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.
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.
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.
Airlines calculate carry-on luggage size measurements using two methods: Height by width by depth: Most – but not all – airlines measure bags by inches or centimeters using this formula: height by width by depth, such as 22 x 14 x 9 inches.
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.