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.
The Patagonia Black Hole Pack 32L laptop pocket. Measuring 22×10.5×6.75 inches/55.9×25.4×17.1 centimeters, this TSA-compliant travel packfalls well within carry-on size limits (which are 22x14x9 inches/55.9×35.6×22.9cm, including wheels and handles; all three measurements may not add up to more than 45 inches).
Their dimensions also often fall under the maximum carry on requirements for peace of mind when traveling light. We recommend using a 30 liter backpack carry on as its often just the right size for airline bag requirements.
This means it's something you could happily take on a weekend away if you're a light packer, or as a day bag if you need to take a lot of stuff. Another good size for plane travel as well, without any concern with carry-on compliance. Here's a packing list for what you can fit in a 32-34 liter backpack.
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.
Carry-on bags shouldn't be larger than 22 inches long, 14 inches wide and 9 inches high including handles and wheels. Dimensions of personal items should not exceed 18 inches long, 14 inches wide and 8 inches high.
A final note if you are looking for a bag to fly with: Checking in at 26.7? x 15.7? x 11.8?, the bag is technically too large to pass as a carry-on bag when packed full. However, if not packed full, I can attest that the bag works great for this purpose.
In the majority of cases, a duffel bag won't be considered a personal item, as they usually exceed the typical maximum size of 18 x 14 x 8 inches or 45 x 35 x 29 cm. However, they will often be classed as a carry-on bag, if they are within the average limit of 22 x 14 x 9 inches or 56 x 36 x 23 cm.
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.