luco and piano?

The Luco is 15 x 12. The Mezzo is 16 x 12, I think. And yes, the difference is that the Luco is more structured and has a Monogram bottom instead of the vachetta.
I own a Mezzo, and it kinda folds in places if it's not full enough, and it slouches. It has a vachetta bottom, unlike the Luco Tote. And the Mezzo is much wider, and I think the Luco has a larger strap drop length. So in comparison with the Piano, the Luco is much larger, more closer to the Mezzo's size.