When you open a flight search in the Kayak app, click on "new bag measurement tool." Scan your bag with your phone's camera starting from the floor and then all around to capture the bag's size. The tool will calculate the bag's measurements and let you know if it likely fits the airline's carry-on dimensions.
The tool also compares all airlines' baggage policies in one place. You can try it if you have an updated iOS device running iOS 11.3 and up. (Apple just released its Measure tool as part of packing the right stuff.on Monday.) Then you can focus on
"A pain point in the travel experience is that moment you begin to worry if your bag will fit in the overhead bin and now we've got a tool that can help," said Giorgos Zacharia, chief technology officer at Kayak, in an email statement. "There are a lot of AR applications that are fun - but this one was designed to be truly useful for travelers."
First published on Sept. 18, 2:47 p.m. PT.
Updates on Sept. 19, 8:51 a.m. PT: Adds Giorgos Zacharia statement and the tool is available with iOS device running iOS 11.3 and up.