sheets 6 forms a part of a bottom support structure which may ensure that the brewing device is self standing when the outer and inner compartments are filled with liquid fig3 illustrates a cross section at the line iii iii of the unfolded brewing device 1 of fig1 b and fig2 at a cross section a little closer to the line iv iv of fig1 a it is noted that the distance between the inside walls at the bottom of the outer compartment 3 is increased when compared to the cross section of fig2 fig4 illustrates a cross section of the line iv iv of the unfolded brewing device 1 of fig1 b fig2 and fig3 in the midst of a the brewing device at line iv iv it is noted that the distance between the inside walls at the bottom of the outer compartment 3 is increased when compared to the cross section of fig3 it is noted that according to an alternative and preferred embodiment of the invention the sheets 6 and sheet material 10 may be formed by one single folded sheet this sheet may comprise a lower arrangement defining welding corresponding to the above described sheet 6 and 10 gathering welding 9 and of course the already described side defining weldings 8 it is furthermore noted that according to a preferred embodiment of the invention the the brewing container materials comprising sheet materials 6 and 10 combined with weldings 8 and 9 and a peelable sealing 18.