I bought the suitcase for the scooter (medley 150) for now and I am satisfied. I believe it is the right size for a medium scooter. It comfortably fits a helmet (full face), gloves, and a few small items.

Very good quality and very user-friendly. It doesn't take any water at all (tested in heavy rain)

I got it for my scooter and so far I am very satisfied, I believe it is the appropriate size for a scooter. It comfortably fits a helmet, gloves, waterproof gear, and a few small items as well.

Very good suitcase, I had it for 5 1/2 years. Flawless operation, excellent quality materials.
Completely waterproof.
The only flaw I could find is that the white side reflectors started to turn yellow from the sun over time. On the other hand, I consider it normal wear and tear.