A method of molding a plurality of multi-layer articles, comprising: injecting a first polymeric material into a mold (200; 2400) defining a plurality of at least four cavities (220; 22A-22D) and configured to form a plurality of at least four resulting multi-layer articles (100; 501), wherein each of the plurality of cavities corresponds to one of the plurality of resulting multi-layer articles; injecting a second polymeric material into the mold (200; 2400) to form an inner layer and an outer layer of each of the plurality of resulting multi-layer articles (100; 501); causing the first polymeric material to flow throughout the mold (200; 2400) to provide each of the plurality of resulting multi-layer articles (100; 501) with an interior layer extending through at least 95% of a surface area of a sealable portion including a base, a sidewall, and a sealing zone, wherein a combined flow is formed from the injecting of the first polymeric material and the second polymeric material, said combined flow comprising a flow front, and wherein injecting the first polymeric material includes injecting the first polymeric material to flow through the mold (200;2400) at a velocity greater than an average flow velocity of the combined flow, positioning a flow stream of the first polymeric material offset from a zero velocity gradient of the combined flow throughout the mold (200; 2400) and flowing the first polymeric material to catch up to the flow front of the combined flow to thereby create a fold over portion at the leading edge of the first polymeric material behind the flow front of the combined flow so as to provide each of the plurality of resulting multi-layer articles with the interior layer extending through at least 95% of the surface area of the sealable portion. injecting a first polymeric material into a mold (200; 2400) defining a plurality of at least four cavities (220; 22A-22D) and configured to form a plurality of at least four resulting multi-layer articles (100; 501), wherein each of the plurality of cavities corresponds to one of the plurality of resulting multi-layer articles; injecting a second polymeric material into the mold (200; 2400) to form an inner layer and an outer layer of each of the plurality of resulting multi-layer articles (100; 501); causing the first polymeric material to flow throughout the mold (200; 2400) to provide each of the plurality of resulting multi-layer articles (100; 501) with an interior layer extending through at least 95% of a surface area of a sealable portion including a base, a sidewall, and a sealing zone, wherein a combined flow is formed from the injecting of the first polymeric material and the second polymeric material, said combined flow comprising a flow front, and wherein injecting the first polymeric material includes injecting the first polymeric material to flow through the mold (200;2400) at a velocity greater than an average flow velocity of the combined flow, positioning a flow stream of the first polymeric material offset from a zero velocity gradient of the combined flow throughout the mold (200; 2400) and flowing the first polymeric material to catch up to the flow front of the combined flow to thereby create a fold over portion at the leading edge of the first polymeric material behind the flow front of the combined flow so as to provide each of the plurality of resulting multi-layer articles with the interior layer extending through at least 95% of the surface area of the sealable portion.