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How big is this suitcase? - suitcase photo

I want to buy a suitcase, a medium size. And I tried, one at Amazon, but do not understand what they mean when they say that its 24inch or 26 inch? He claims that the height or width? KUASI when measured from 24 inches to a meter, it seems rather small, but then on the big picture, it seems that enough?

What only a few centimeters? measure on which side of the bag?

http://www.amazon.co.uk/black-eva-trolle ...