Pad with internal chamber and opening mechanism

A device (D) containing a product, which device (D) comprises a front layer (1) and a utility layer (6) being welded over a part of their outer periphery to form an outer protective surface of the device (D), a contact layer (2) also being welded between the front layer (1) and utility layer (6), characterized in that a valve layer (3), a top layer (4) and a bottom layer (5) are arranged between the contact layer (2) and utility layer (6), the top layer (4) and bottom layer (5) being welded together by a weld (11) to form a closed storage chamber (8) in the device (D), each of the valve layer (3) and top layer (4) being provided with a plurality of incisions or indentations (9a, 9b), the incisions or indentations (9a) of the valve layer (3) being connected to the incisions or indentations (9b) of the top layer (4) by a weld (13) to form an opening mechanism in the device (D) and the bottom layer (5) being connected to contact layer (2) and/or to the utility layer (6), where the movement of the valve layer (3) relative to the top layer (4) will provide an opening of the incisions or indentations (9a, 9b) in the valve layer (3) and top layer (4).