FAQ THE MATTRESSES CAN THE CASPER BE USED ON BUNK BEDS? SEE ALL QUESTIONS CAN THE CASPER BE USED ON BUNK BEDS? We do not recommend using Casper mattresses with a bunk bed. Our twin mattress poses a couple of different issues in this setup, but it's mainly a safety thing in regard to thickness. YOU MAY ALSO LIKE What setup do you recommend for a Casper mattress?