If that’s your sole bag you’re bringing along ... so while these are all billed as being able to fit under a seat, it’s always best to check those of the airline you plan to fly next ...
Where once tickets used to include one standard cabin bag (dimensions 56 x 45 x 25cm ... to keep everything compact and easily stowed under the seat in front of you. Carrying a max of 30L ...
Your personal item should be able to fit neatly under the seat in front of you ... However, if you're shopping for new carry-on luggage, it's best to opt for something that meets the requirements ...