Personal Items: Personal items can be no larger than 14" tall, 18" wide, and 8" long. Personal items must fit completely within the personal item portion of the bag sizer.Think purses, totes, computer bags, briefcases, and kids backpacks! Carry-On Baggage: Carry-On Bags can be no larger than 24" tall, 10" wide, and 16" long (including handles, wheels, and straps) and no heavier

Air Canada Standard carry on luggage allowance is 1 carry on bag + 1 personal item. For carry on bag the allowed dimensions is as follows : 21.5in 55cm in height / 9in 23 cm in width /15.5in 40cm length. For the personal item the allowed dimensions is as follows : 13in 33cm in height / 6in 16 cm in width /17in 43cm length.
United's maximum allowed free personal item sizing is actually smaller than Spirit's at 9 inches x 10 inches x 17 inches. Low-cost competitor Frontier Airlines ' free personal item maximum size is the same as Spirit's. When deciding if that is enough space, factor in that medical devices (including formula and breast pumps), an infant diaper If more than six personal electronic individual devices are already secured, then you will have to check-in your device into your hand baggage, which will be stored in the aircraft hold. If you are unable to check-in your hand baggage with the device or do not have a hand baggage, then your item will need to be deposited with Lost and Found . . 102 141 246 207 272 360 411 48

do airlines check personal item size