Looks like all the pizza would be slumped.. in the bottom.. standing on edge ..
a rigid bottom version of the insulated delivery bags would be ideal.. Pie carried flat..
( I get take & bakes, on my bike friday, with a front pannier rack the bags have D rings
so the stretch net goes on that full width . pie mostly flat, I straighten it out before I put it in the oven..
Boxed cooked ones go under the stretch net just fine.....