How to receive massive amounts of mail

I'm a freshman so I'm kind of new to "adulting" and whatnot. I'm currently receiving a hefty stream of mail, and I've already gotten an email from my dorm's mail room telling me to collect it more frequently because there's too much to fit in the mailbox..

I'm expecting the amount of mail to increase possibly 5-10X soon, and I don't want to burden the mailroom staff. Is there some kind of mailbox service I can purchase??