Airlines often state the maximum allowable size of their carry-on and checked baggage as "Maximum Linear Dimensions", also known as "Linear Length". What does this mean? The linear dimensions, or total linear length, of your luggage are the sum total of the length, width, and height of your suitcase. This number may not exceed the "Maximum Linear Dimensions" allowed by your airline, typically 62 inches (158cm) for most airlines.
When calculating the linear dimensions of your luggage, you will have to take three measurements of your luggage: the Length, Width and Height. Be sure to include any handles or wheels if they are sticking out while collapsed. Then, simply add the three measurements together, like so:
Length + Width + Height = Total Linear Length
This number, the total of all three measurements that you took, must be less than or equal to the Maximum Linear Dimensions that your airline allows. Usually, that means the Total Linear Length cannot exceed 62 inches or 158cm for checked baggage.
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