first, dose it have a bathtub floor like the Vapr?
Bathtub floor? I think you've got the wrong idea about how the Vapr bivy is built.
Think of two flat sheets that meet at the edges, with the top one Quantum and the bottom silnylon. Sew them together along the edges, except for the foot box. Now "box" the footbox (at the same time narrowing the bivy at that end. Do the same for the hood end.
In short, there's no "bathtub floor." Ideally, if you're dead center in the bivy, the height of your torso (lying down) will pull the sides up a bit. But if you roll, or slide to one side, the edge is right on the ground. Nothing keeps it off the ground at all.