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!
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Frontier's Seating PolicyAt least one adult flying with a child under the age of 14 will automatically be seated next to them without having to pay an additional seating fee. They must be on the same reservation for fee-free adjacent seating. Efforts to implement this policy have been in effect since October 2022.
In general, your personal item should be smaller than your carry-on and under the specific airline's carry-on dimensions, allowing it to fit under the seat in front of you. In most cases, backpacks are considered personal items as long as they fit under the seat in front of you.
To do this, measure the linear dimensions - the height, width and depth of the backpack, then multiply these three values. The result will be the volume of the backpack in cubic centimeters or meters (depends on the unit of measurement taken as the base).