Beverage Co-Packers For Both Milk and Juice?

Milk and juice are entirely different categories, both in terms of product and processing. Milk is extremely sensitive, operates on a strictly cold supply-chain and requires batch-oriented retort processing to get shelf life. Milk is so sensitive, that often even remnants of juice not properly cleaned out can leave behind an acidic residue that will cause milk to split. Most organized co-packers handle one or the other. In the rare event that a beverage co-packer will handle both milk and juice, the lines (and staff managing those lines) will be entirely separate.