Dimensions On A Standard Suitcase How Exactly Are Product Dimensions Read? Ordering Something On Amazon & The Dimensions Are 9 X 20 X 7.5 Inches?

How exactly are product dimensions read? Ordering something on Amazon & the dimensions are 9 x 20 x 7.5 inches? - dimensions on a standard suitcase

... This is the height, length, width ??.... also the assessment by the scale would say that the problem may be in a standard size bag? Here http://www.amazon.com/Altec-Lansing-inMo ...