According to airline policy, any personal items stowed beneath seats should not exceed 18 inches by 14 inches by 8 inches.
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A: Yes it will fit underneath an airline seat. A: it depends on the airline. For southwest, it's allowable as a carryon but not as a personal item that fits under a seat. They state that it must fit 16.25” (L) + 13.5” (W) + 8” (H).
For international or budget airlines, choose a bag under 40L. If you want to pack ultralight, anything 35L or under can be carried on virtually any airline.
Southwest Airlines' website recommends a personal item that's no larger than 18.5 inches x 8.5 inches x 13.5 inches. Spirit Airlines allows a personal item for all travelers that must not exceed 18 inches x 14 inches x 8 inches, including handles and wheels.
The 40L will max out carry on dimensions on most airlines so you never have to check a bag. For stricter airlines, like RyanAir, 30L will be a better choice.
I've only expanded it to 45L for trips longer than a week or so. In either mode, it won't fit under the seat in front of you on a flight, but it will fit in the overhead compartment.
Airlines may sometimes ask you to buy a new seat in order to fit your big item. Then, the additional fee will be significant. Even worse, if your personal item is too large or heavy, it is possible that you have to leave it or be denied entry.
A personal item is any type of luggage that fits underneath the plane seat in front of you. Most domestic airlines in the United States require a personal item to be 18” x 14” x 8” or smaller in size. Personal items can include a purse, briefcase, small backpack, laptop bag, weekender or small duffel bag.
You will be fine, you probably won't even need an extender on your belt. A size 22 won't have difficulty fitting in a airline seat, and doing up the seat belt.
Just unzip the bag, lay it flat on the conveyor belt, and send it right through the X-ray machine. Our airport security laptop bag is designed to make dealing with the TSA a breeze.
Suitcases are better for your backThat's really down to how big your backpack is, of course, and what you pack, but a carry-on sized suitcase you push around is always going to be easier on your shoulders.
While this can be confusing, most popular airlines allow you to bring a carry-on and personal item, such as a backpack or purse. 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.