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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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.
With plenty of space to pack bulky clothes, we think the Nomatic Travel Bag 40L would make an excellent carry-on backpack for any and all types of trips since it can be carried multiple different ways—which also makes it an ideal convertible bag.
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.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night.
The design of the 70L is perfectly suited for airplane carry-on or check in, and the features of the 70L are perfect for any adventure once you arrive at your destination. Being able to compress the 70L allows you to use it as carry-on for all major airlines in the US and Canada.
If you will potentially need that extra capacity on a future trip, then definitely get the 75L pack. If you're doing it just because it doesn't seem like much extra weight, even if you don't expect to ever need it, I would go for the 65L pack. That would also curb the temptation to overpack.
Size Matters (but Bigger Isn't Better)Like a few other things in life, size matters when it comes to choosing a backpack — but not in the way you might think. Based on many years of dragging excessively large backpacks around the world, I have to say bigger is not better. You do not need an 80 or 90 litre pack.
Is a 40L backpack big enough for traveling? 40 liters is definitely big enough for traveling, as long as you're not an over-packer. It's a good idea not to go for an overly large backpack - overpacking can be as troublesome as under-packing.
Our smallest Black Hole® Duffel, with a 40-liter volume that's perfect for small loads and long weekends, is made with 100% recycled body fabric, lining and webbing. This carry-on sized duffel meets most airline and train carry-on requirements.
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.
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.
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.
75L is a fairly large backpacking rig, especially loaded, even with lightweight space age ultra-costly materials - Pretty sure its not going on board - you're going to have to pony up for checked baggage bud. The cabin luggage is meant to be 22cm x 35cm × 56cm.
All carry-on luggage must fit in the overhead bin or under the seat in front of you and adhere to the following requirements: Maximum Dimensions of Carry-on: 22 in x 16 in x 8 in/55 cm x 40 cm x 20 cm. Maximum Weight of Carry-on: 22 lbs (10 kg) Maximum Dimensions of Small Bag: 14 x 8 x 8 in/35 x 20 x 20 cm.