Other features you may want to consider when purchasing new carry on luggage include for easier maneuverability and to help prevent your suit or dress from wrinkling during travel.
International: Many international flights have additional restrictions on carry on luggage including weight restrictions. As a general rule, an international carry on should be 20" or less and should weigh no more than 50 pounds when packed. Again, be sure to check with your airline for their specific rules as they can vary by carrier and destination.
Overhead vs. Under Seat: If you're traveling for one day (or less) or you plan to check luggage and want to take only a few items with you on board, consider a small carry on bag like a that fits underneath the seat. Overhead bin space is often scarce particularly if you're one of the last people to board the plane. On the other hand, if you plan to travel with your carry on luggage only, choose a larger size bag that can fit in the overhead bin but still hold your clothing and other travel necessities.
Carry On Size: Knowing the size of your carry on luggage is crucial for making sure your bag not only fits in the overhead bin, but also meets airline requirements. You can easily calculate the size of your suitcase by adding the length, width, and height of the bag, making sure to take into account all handles, wheels, expansion, and other extrusions. eBags has identified 22" x 14" x 9" as our basic guideline, but your carry on should be no larger than 45" in total measurement. However, size restrictions do vary by airline so please check your carrier's website before travel.