A carry-on travel backpack can be a game-changer for any traveler. Whether you're a frequent flyer or just taking a weekend trip, having a backpack that meets the size requirements for carry-on luggage can save you time and money while also giving you the freedom to move around more easily. When choosing a carry-on travel backpack, there are a few key factors to consider....

A carry-on travel backpack must do two things well: fit the traveler and fit the airline's current size rules. Capacity in liters is helpful for packing, but exterior height, width, and depth determine whether the bag actually fits an overhead-bin limit.Quick Answer: Measure the backpack's fully packed exterior dimensions, compare them with your airline's current carry-on limit, and choose a capacity you can carry...