Best way to transport Manuals?

Hello reddit, I come to you with a problem, in a couple of months a big con in my city will take place, it's a huge event where I intend to buy as many manuals as I can, just as I did last year.

The problem with last time is that I used my travel suitcase to transport all the books I bought, by the end of the first day they barely fit and some got ever so slightly bent. so I ask you, how do you usually transport a big number of manuals without damaging them?

Edit: I am driving to the con, and can't enter and exit the building due to regulations so I can't do frequent travels to and back from my car, also mail is a no go here in Italy, far to expensive. I just need something I can carry a large number of books around the con without worrying about damaging them.