A process for fabricating a tube having a closed, rounded bottom wall, a top edge, and a sidewall between the bottom wall and top edge in a single-step co-injection molding process comprising the steps of: providing a first molten polymeric material and a second molten polymeric material, the first and second polymeric materials (62, 60) being non-compatible, wherein the first polymeric material is a gas barrier material and the second polymeric material is a liquid vapor barrier material, or the first polymeric material is a liquid vapor barrier material and the second polymeric material is a gas barrier material; and directing the first and second molten polymeric materials (62, 60) through a nozzle section (68, 70), a cold sprue (72, 74), and subsequently into a mold cavity (76, 78) that comprises a region for integrally forming the bottom wall of the tube, wherein the first and second molten polymeric materials (62, 60) co-flow in the mold cavity (76, 78) for at least a portion of the fabrication process, and wherein the cold sprue (72, 74) is separate and removed from the mold cavity (76, 78), wherein, during the co-flow, the nozzle section (68, 70) directs the first and second molten polymeric materials (62, 60) into the mold cavity (76, 78) as inner and outer skin layers (54, 56) of the first molten polymeric material with a core layer of the second molten polymeric material between the inner and outer skin layers (54, 56), wherein the core layer is encapsulated by the inner and outer skin layers (54, 56) that are directly adjacent the core layer, wherein liquid vapour material and the gas barrier material is present throughout the bottom wall and throughout the sidewall in all but the top edge of the tube and this top edge has a cross-section of only the skin material (54, 56), wherein there is substantially continuous coverage of both the liquid vapor barrier material and the gas barrier material throughout both the bottom wall and throughout the side wall, wherein throughout the side wall is defined as up to within 2.54 mm (0.1 inches) of the top edge of the tube and wherein substantially continuous coverage is defined by the respective material being found in at least 98% of the cross-section of the respective area, and wherein the tube is formed without a subsequent blow-molding step. providing a first molten polymeric material and a second molten polymeric material, the first and second polymeric materials (62, 60) being non-compatible, wherein the first polymeric material is a gas barrier material and the second polymeric material is a liquid vapor barrier material, or the first polymeric material is a liquid vapor barrier material and the second polymeric material is a gas barrier material; and directing the first and second molten polymeric materials (62, 60) through a nozzle section (68, 70), a cold sprue (72, 74), and subsequently into a mold cavity (76, 78) that comprises a region for integrally forming the bottom wall of the tube, wherein the first and second molten polymeric materials (62, 60) co-flow in the mold cavity (76, 78) for at least a portion of the fabrication process, and wherein the cold sprue (72, 74) is separate and removed from the mold cavity (76, 78), wherein, during the co-flow, the nozzle section (68, 70) directs the first and second molten polymeric materials (62, 60) into the mold cavity (76, 78) as inner and outer skin layers (54, 56) of the first molten polymeric material with a core layer of the second molten polymeric material between the inner and outer skin layers (54, 56), wherein the core layer is encapsulated by the inner and outer skin layers (54, 56) that are directly adjacent the core layer, wherein liquid vapour material and the gas barrier material is present throughout the bottom wall and throughout the sidewall in all but the top edge of the tube and this top edge has a cross-section of only the skin material (54, 56), wherein there is substantially continuous coverage of both the liquid vapor barrier material and the gas barrier material throughout both the bottom wall and throughout the side wall, wherein throughout the side wall is defined as up to within 2.54 mm (0.1 inches) of the top edge of the tube and wherein substantially continuous coverage is defined by the respective material being found in at least 98% of the cross-section of the respective area, and wherein the tube is formed without a subsequent blow-molding step.