The present invention relates to a glass container (100) comprising as container parts i) a glass tube (101) with a first (102) and a further end (103), the glass tube (101) having a wall thickness dw and an outer diameter dc; ii) a glass bottom (104), wherein the glass bottom (104) closes the glass tube (101) at the first end (102); iii) a curved glass heel (105) extending from an outer area (106) of the glass bottom (104) to the first end (102) of the glass tube (101); wherein the curved glass heel (105) is defined by an outer radius (ro), an inner radius (ri) and a thickness of the glass (dh) in the curved glass heel and wherein the following condition is fulfilled : 100譫h3譺i/dw譫c2+4.4mm2/dc>0.55mm.The present invention also relates to a process for the preparation of a closed glass container (121), to a closed glass container (121) obtainable by this process and the use of a glass container (100) for packaging a pharmaceutical composition.