The Brief Volunteers are assembling thousands of free backpacks at the Hillsborough County Fairgrounds for an upcoming school supply drive Saturday. More than 100 community vendors will attend the second annual Back 2 School Bash to provide family resources and local support. Volunteers are assembly-lining thousands of free back-to-school backpacks at the Hillsborough County Fairgrounds to help local families prepare for the upcoming school year. Hillsborough County school supply driveWhat we know:Volunteers from the Emergency Care Help Organization (ECHO) helped organize the backpack packing this week. Several community sponsors, a mix of local businesses, nonprofits and churches, donated and funded the school supplies.