Somers, NY-based Pepsi Bottling Group (PBG) has signed an agreement with CytoSport, Inc. Benicia, CA, to distribute the protein-enhanced functional beverage Muscle Milk in the U.S. Under terms of the agreement, PBG will have a license to distribute the ready-to-drink line of Muscle Milk and Muscle Milk Light in the U.S. and Canada. PBG will begin distribution in the U.S. in January. Financial terms of the transaction were not disclosed.