So, how can you ensure that your carry-on is the perfect size? First, measure your bag carefully, and make sure it fits in the overhead bin. You can also use a carry-on bag with a built-in measuring tape, which can be a total lifesaver!
Carry-on and Personal Item Size Limits for 32 Major Airlines | American
Another great tip is to pack smart: use packing cubes and roll your clothes to make the most of your carry-on space. And don't forget to leave some extra room for souvenirs and other goodies you might pick up on your travels!