I too have a saggy bianca butt. But it's not dramatically saggy, and considering the soft structure of the bag, I figure that's to be expected. On a scale of saggy bag butts, I would say it's not as saggy as some of those LV speedys.
I think it is called "silver" - that is what the Ebay auction said. The bag is a camel color with a silver metallic crackle glaze. The authenticity cards and none of the tags say the style or what the official color is.