A container comprising: a closed end having a closed end periphery ; and a peripheral wall extending from said closed end periphery about a longitudinal axis (L) of said container to an open end , said closed end and said peripheral wall comprising a thermoplastic material; wherein said peripheral wall defines a variable open cross-section of said container in a plane orthogonal to said longitudinal axis as a function of distance from said closed end; wherein said container has a waist having a waist open cross-section orthogonal to said longitudinal axis that is smaller than said open cross-section orthogonal to said longitudinal axis above and below said waist; wherein said peripheral wall comprises a faceted region comprising a plurality of facets arranged edge to edge with one or more adjacent facets and said facets having facet exterior surfaces, at least a portion of said faceted region being located nearer to said closed end than to said open end wherein the facets are substantially flat and the plurality of facets are arranged to extend in a direction from towards the closed end towards the open end of the container; wherein said peripheral wall has a peripheral wall exterior surface oriented away from said longitudinal axis, said peripheral wall exterior surface having a peripheral wall exterior surface area ; wherein each of said plurality of facets has a facet exterior surface oriented away from said longitudinal axis and each of said facets has a facet exterior surface area that is between 0.0001% and 4% of said peripheral wall exterior surface area; and wherein said peripheral wall above said waist is free from said facets, characterised in that said facet exterior surfaces of said plurality of facets are positioned convexly relative to said longitudinal axis. a closed end having a closed end periphery ; and a peripheral wall extending from said closed end periphery about a longitudinal axis (L) of said container to an open end , said closed end and said peripheral wall comprising a thermoplastic material; wherein said peripheral wall defines a variable open cross-section of said container in a plane orthogonal to said longitudinal axis as a function of distance from said closed end; wherein said container has a waist having a waist open cross-section orthogonal to said longitudinal axis that is smaller than said open cross-section orthogonal to said longitudinal axis above and below said waist; wherein said peripheral wall comprises a faceted region comprising a plurality of facets arranged edge to edge with one or more adjacent facets and said facets having facet exterior surfaces, at least a portion of said faceted region being located nearer to said closed end than to said open end wherein the facets are substantially flat and the plurality of facets are arranged to extend in a direction from towards the closed end towards the open end of the container; wherein said peripheral wall has a peripheral wall exterior surface oriented away from said longitudinal axis, said peripheral wall exterior surface having a peripheral wall exterior surface area ; wherein each of said plurality of facets has a facet exterior surface oriented away from said longitudinal axis and each of said facets has a facet exterior surface area that is between 0.0001% and 4% of said peripheral wall exterior surface area; and wherein said peripheral wall above said waist is free from said facets, characterised in that said facet exterior surfaces of said plurality of facets are positioned convexly relative to said longitudinal axis. <EOS>