The 55L is technically too big, especially when fully packed, but some travelers have been able to use it as a carry-on when it's not completely full.
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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.
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.
The 60L does fit in the overhead bins on most airplanes even when full, and it holds a lot of stuff. I've fit two weeks worth of clothes, multiple pairs of shoes, towels, etc. into this bag for a long trip.
Including handles and wheels, the maximum dimensions for a carry-on are 22 inches long, 14 inches wide and 9 inches high. Personal items are limited to 17 inches long, 10 inches wide and 9 inches high.
A 50L+ backpack is a great friend to those travelling for a few weeks. These bags are spacious and can accommodate a number of outfit changes before you ever have to visit a laundromat. But don't be tempted to fill your pack to its capacity before you've even left - remember to save space for souvenirs!
40-50 LitersBackpacks falling around the middle of this range (around 45L) can also be used in place of suitcases when traveling internationally. You can expect to fit the following in a 40-50L backpack: 2L water bottle. 2 hoodies or a lightweight jacket.