How can I accurately measure the size of a 28-inch luggage?

To accurately measure the size of a 28-inch luggage, use a measuring tape to measure the height, width, and depth of the luggage. Add these measurements together to get the total size of the luggage. Make sure to measure from the bottom of the luggage to the top for the height, from one side to the other for the width, and from the front to the back for the depth.