Manga Cover

How to keep Manga from bending?
Hello, I’m wondering if theres an easy way to keep my manga covers from bending to much, you know how the cover page like sticks up, can someone help me out I wanna keep the front a back covers flat.
It cant be helped, they will always bend, its the material. what you can do is after you finish reading it, compress it by putting really heavy books on top of it to flatten it out again, it will help some.
i have a lot of paperback books and i do this.
yalan-manga(cover) delgec