In 1977, the Minnesota Legislature enacted a statute banning the retail sale of milk in plastic nonreturnable, nonrefillable containers, but permitting such sale in other nonreturnable, nonrefillable containers, such as paperboard milk cartons. 1977 Minn. Laws, ch. 268, Minn. Stat. § 116F.21 (1978). Respondents contend that the statute violates the [[Equal Protection]] and [[Commerce Clause]]s of the [[Constitution]]. | In 1977, the Minnesota Legislature enacted a statute banning the retail sale of milk in plastic nonreturnable, nonrefillable containers, but permitting such sale in other nonreturnable, nonrefillable containers, such as paperboard milk cartons. 1977 Minn. Laws, ch. 268, Minn. Stat. § 116F.21 (1978). Respondents contend that the statute violates the [[Equal Protection]] and [[Commerce Clause]]s of the [[Constitution]]. |