If the door is in the middle, you can open half of the cover, but if, for example, the door is at the front, you only need to open up to the door.
The measurements are given in cm: LxWxH
You measure the length from the back to the front of the suitcase to get the correct size. If the length of the trolley is, for example, exactly 520, a larger size is recommended. Please contact customer service if you are unsure about which measurement you have, and we will assist you.