A fragrance source comprising: (a) a back sheet comprising: a fold line dividing the back sheet into a main portion and a flap comprising two adhesive frames on the surface of the flap on the inner side of the fold line; and (b) a front sheet comprising: two windows (41a, 41 b), and (c) two strips of wicking material (37a, 37b) between said back sheet and front sheet, said strips (37a, 37b) having an elongate rectangular shape provided towards one end with a pair of inwardly directed registering notches (39a, 39b), dividing said strips (37a, 37b) into a larger portion and a smaller portion wherein (d) said main portion of the back sheet and the front sheet are joined together by three lines: a connecting closed line extending around the peripheries of the main portion and the front sheet and thus forming a closed main chamber between said main portion and front sheet; a longitudinal line which extends along the gap between said first and second strips (37a, 37b) thus sub-dividing the said main chamber to form separate chambers each containing a respective strip (37a, 37b); and a lateral line extending between the side edges of said main portion and of the front sheet into said notches (39a, 39b) and being interrupted between said notches (39a, 39b) and wherein (e) said flap is folded with said adhesive frames sealing around the peripheries of said windows (41a, 41b) in register with a respective shorter portion of an associated one of the first and second strips (37a, 37b). (a) a back sheet comprising: a fold line dividing the back sheet into a main portion and a flap comprising two adhesive frames on the surface of the flap on the inner side of the fold line; and a fold line dividing the back sheet into a main portion and a flap comprising two adhesive frames on the surface of the flap on the inner side of the fold line; two adhesive frames on the surface of the flap on the inner side of the fold line; (b) a front sheet comprising: two windows (41a, 41 b), and two windows (41a, 41 b), (c) two strips of wicking material (37a, 37b) between said back sheet and front sheet, said strips (37a, 37b) having an elongate rectangular shape provided towards one end with a pair of inwardly directed registering notches (39a, 39b), dividing said strips (37a, 37b) into a larger portion and a smaller portion wherein said strips (37a, 37b) having an elongate rectangular shape provided towards one end with a pair of inwardly directed registering notches (39a, 39b), dividing said strips (37a, 37b) into a larger portion and a smaller portion wherein (d) said main portion of the back sheet and the front sheet are joined together by three lines: a connecting closed line extending around the peripheries of the main portion and the front sheet and thus forming a closed main chamber between said main portion and front sheet; a longitudinal line which extends along the gap between said first and second strips (37a, 37b) thus sub-dividing the said main chamber to form separate chambers each containing a respective strip (37a, 37b); and a lateral line extending between the side edges of said main portion and of the front sheet into said notches (39a, 39b) and being interrupted between said notches (39a, 39b) and wherein a connecting closed line extending around the peripheries of the main portion and the front sheet and thus forming a closed main chamber between said main portion and front sheet; a longitudinal line which extends along the gap between said first and second strips (37a, 37b) thus sub-dividing the said main chamber to form separate chambers each containing a respective strip (37a, 37b); and a lateral line extending between the side edges of said main portion and of the front sheet into said notches (39a, 39b) and being interrupted between said notches (39a, 39b) and wherein (e) said flap is folded with said adhesive frames sealing around the peripheries of said windows (41a, 41b) in register with a respective shorter portion of an associated one of the first and second strips (37a, 37b).