There are no limits in state and federal prison. The county jail is different as the inmates have less storage space.
https://www.inmateaid.com/ask-the-inmate/how-many-books-can-you-send-per-week-is-there-a-set-limit-an-inmate-can-have-at-a-time-thanks-in-advance#answer
Accepted Answer Date Created: March 12,2019