Packer Bottles are made of food grade high-density polyethylene. HDPE material is milky white in natural form. The bottle is opaque and child resistant. It offers the following characteristics: 1) Good impact strength resistance. 2) Good stress crack resistance. 3) Good chemical resistance. 4) Good vapor barrier. HDPE is a recyclable plastic. The packer bottles also come with a child resistant pressure seal foam liner cap. The foam liner reads, “sealed for your protection” one you close the child resistant cap.