What is the difference between a personal item and a carry-on?

Personal item: It cannot be larger than 14"H, 18"W, 8"D. These are usually purses, totes, computer bags, briefcases, small backpacks and diaper bags! This bag must be no larger than 14”X18”x8” and fit under the seat in front of you.

Carry-on bag: Your carry-on bag must be able to fit either underneath the seat or in the overhead bin. It cannot be larger than 24"H, 16"W, 10"D (including handles, wheels, and straps) and no heavier than 35 pounds. These are usually large backpacks, duffel bags and small suitcases/wheeled bags!