How to fix “squished” PST?

  1. I used to suck at storing my bags, and sure enough, it’s biting me in the a**.
    My caviar PST was wedged between other things (plus I didn’t use appropriate “stuffing”) and now the sides are “wrinkled”. Will it eventually get back to normal if I stand it upright with a lot of stuffing? (I know that my LV mini monos all somehow get back to their original shape if I just let it freely stand without anything touching it for a day or two.)
    Or will I just have to accept this condition?