An insulated container comprising: a double-walled structure comprising a closed end, an open end, and a side wall extending between the closed and open ends (22, 24), and a stepped portion provided in an inner surface of the double-walled structure and extending partially from the open end towards the closed end, wherein the side wall and the closed end together form a hollow interior; a glass structure arranged within the hollow interior, the glass structure comprising a body having an open upper end and a base end, and a sipping portion extending from the upper end, the sipping portion comprising a sipping end and a shoulder end spaced apart from the sipping end, wherein the sipping portion protrudes from the open end of the double-walled structure and the body is disposed within the hollow interior of the double-walled structure; and characterized in that the insulated container further comprises a deformable flange extending around the body of the glass structure adjacent the upper end of the body of the glass structure, wherein the deformable flange comprises a main body and a plurality of protrusions extending from the main body, and wherein an outer diameter of the main body and protrusions (40, 42) of the deformable flange is greater than an inner diameter of the double-walled structure, such that the protrusions are compressed between the inner surface of the double-walled structure and an outer surface of the glass structure, thereby engaging the protrusions with the inner surface of the double-walled structure and retaining the glass structure within the hollow interior of the double-walled structure. a double-walled structure comprising a closed end, an open end, and a side wall extending between the closed and open ends (22, 24), and a stepped portion provided in an inner surface of the double-walled structure and extending partially from the open end towards the closed end, wherein the side wall and the closed end together form a hollow interior; a glass structure arranged within the hollow interior, the glass structure comprising a body having an open upper end and a base end, and a sipping portion extending from the upper end, the sipping portion comprising a sipping end and a shoulder end spaced apart from the sipping end, wherein the sipping portion protrudes from the open end of the double-walled structure and the body is disposed within the hollow interior of the double-walled structure; and a body having an open upper end and a base end, and a sipping portion extending from the upper end, the sipping portion comprising a sipping end and a shoulder end spaced apart from the sipping end, wherein the sipping portion protrudes from the open end of the double-walled structure and the body is disposed within the hollow interior of the double-walled structure; and characterized in that the insulated container further comprises a deformable flange extending around the body of the glass structure adjacent the upper end of the body of the glass structure, wherein the deformable flange comprises a main body and a plurality of protrusions extending from the main body, and wherein an outer diameter of the main body and protrusions (40, 42) of the deformable flange is greater than an inner diameter of the double-walled structure, such that the protrusions are compressed between the inner surface of the double-walled structure and an outer surface of the glass structure, thereby engaging the protrusions with the inner surface of the double-walled structure and retaining the glass structure within the hollow interior of the double-walled structure.