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 , 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 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 , 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 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 . <EOS>