Container (1;1';300) with a portion dispensing device (20;200;320;450) for dispensing portions of a product from the container, the container having a container body with a main reservoir for storage of product, the portion dispensing device (20;200;320;450) comprising: - a variable volume product chamber (30,31,32;131;451) and associated variable volume product chamber restoring means (35;131;451), which variable volume product chamber has: - a product outlet (40;350) for passing product from the variable volume product chamber, wherein an outlet valve is associated with said outlet, - a product inlet in communication with the main reservoir, wherein an inlet valve (60;160) is associated with said product inlet, wherein the variable volume product chamber (30,31,32;131;451) has a volume that is reduced upon increased pressurization of product in the main reservoir of the container (1,1';300), and that is increased, at least aided by said variable volume product chamber restoring means (35;131;451), when the increased pressurization of product in the main reservoir of the container is removed, wherein the inlet valve (60;160;460) is configured to close the product inlet upon increase of pressurization of the product in the main reservoir so that product is then passed from the chamber via the product outlet, and wherein the inlet valve (60;160;460) is configured to open the product inlet upon removal of said increased pressurization so as to allow for the flow of product from the main reservoir into the variable volume product chamber, and wherein the inlet valve (60;160;460) has a movable valve member (65;480) and an associated seat (66;490) for said valve member, and wherein increased pressurization of product in the main reservoir urges the movable valve member onto the seat, characterised in that the inlet valve (60;160;460) is a underpressure actuated inlet valve, the movable valve member having a first surface in communication with the atmosphere so as to be exposed to atmospheric pressure and a second surface in communication with the variable volume product chamber so as to be exposed to pressure in said variable volume product chamber, the inlet valve being (60;160;460) configured such that - when a underpressure is created in the variable volume product chamber as a result of increase of the volume of said chamber due to removal of the increased pressurization of the product in the main reservoir - the movable valve member is caused to move from its seat, thereby allowing flow of product from the main reservoir into the variable volume product chamber. - a variable volume product chamber (30,31,32;131;451) and associated variable volume product chamber restoring means (35;131;451), which variable volume product chamber has: - a product outlet (40;350) for passing product from the variable volume product chamber, wherein an outlet valve is associated with said outlet, - a product inlet in communication with the main reservoir, wherein an inlet valve (60;160) is associated with said product inlet, - a product outlet (40;350) for passing product from the variable volume product chamber, wherein an outlet valve is associated with said outlet, - a product inlet in communication with the main reservoir, wherein an inlet valve (60;160) is associated with said product inlet,