Commissaries are hoping shoppers in the United States will say yes to paper bags for bagging their groceries as part of the Defense Commissary Agency’s measures to offset recent major cost differentials between plastic and paper bags. The cost difference amounts to big bucks. DeCA spent about $20 million on bags last year to handle its nearly 100 million customer transactions. The cost of paper bags has increased 34 percent in the past three years, while plastic bag costs have risen 84 percent. Shipping costs offset the difference for overseas commissaries, so the paper bag emphasis isn’t applied there, although double bagging is discouraged DeCA-wide. Commissaries in the United States have targeted usage goals of 70 percent paper and 30 percent plastic, and customers will be hearing more, “Is paper okay?”