Lockers are available for rent inside Centeroo at the Arch entrance, as well as within the VIP area or the GA+ lounge (note that you also need a GA+ ticket or a VIP ticket to access those areas. VIP does not have access to the GA+ lounge). Use the locker to store your personal items in all weekend long while in the venue (some options even include chargers!). Locker locations will remain open and accessible during all Centeroo hours.
When you're ready, you can rent your locker here: https://www.entertainmentlockers.com/bonnaroo-2021-lockers/