Pak-A-Sak began offering drive-through service with the opening of the larger prototype on Southwest 58th Avenue at Georgia Street, and a second that followed last year at 6320 S. Bell St., south of Hillside. Drive-up windows at the stores have been busy, but exactly how busy is a closely guarded McKee secret. “I’d just say we’re having good success with our drive-throughs in our two latest stores,” Brian McKee said. Customers hitting a Pak-A-Sak Express drive-through will be able to get anything in the store, which also will cater to walk-in customers, the McKees said. Express locations will stock about 90 percent of the items available at the larger stores, President Terry McKee said. The inventory will include a wide array of candy and snacks and other items, but some products, such as canned soups, will be limited to best-sellers, Brian McKee said. New offerings will include a tea bar.