A product comprising: - a closed thin-walled plastic bottle (11; 11A; 11B) comprising an at least partly cylindrical body and defining an internal volume, the cylindrical part of the bottle having a lateral surface whose generatrices are parallel straight lines that follow a closed base curve defined by the intersection of the lateral surface with a plane perpendicular to an axial direction of the bottle, - a liquid to be drunk filling at least 80% of the internal volume of the bottle (11; 11A; 11B), the bottle (11; 11A; 11B) comprising at least one activatable portion with a concavity oriented along a first direction in a relaxed state, the activatable portion being arranged to deform under a force exerted by a consumer to pass into an activated state and to have a convexity oriented in a direction opposite to the first direction, a pressure exerted by the liquid on the bottle (11; 11A; 11B) closed with the activatable portion in the relaxed state being lower than a pressure exerted by the liquid on the bottle (11; 11A; 11B) closed with the activatable portion in the activated state, the body of the bottle (11; 11A; 11B) having a thickness within a range from 30 μm to 150 μm, wherein the activatable portion forms a bottom of the bottle (11; 11A; 11B), wherein the activatable portion is rounded outwards in the relaxed state, and wherein the activatable portion is arranged to remain in the activated state or in the relaxed state as long as a pressure is not exerted by the user to change state, characterized in that the bottom has at least one radial groove which extends over a length of at least 10% of the diameter of the cylindrical part of the body. - a closed thin-walled plastic bottle (11; 11A; 11B) comprising an at least partly cylindrical body and defining an internal volume, the cylindrical part of the bottle having a lateral surface whose generatrices are parallel straight lines that follow a closed base curve defined by the intersection of the lateral surface with a plane perpendicular to an axial direction of the bottle, - a liquid to be drunk filling at least 80% of the internal volume of the bottle (11; 11A; 11B), the bottle (11; 11A; 11B) comprising at least one activatable portion with a concavity oriented along a first direction in a relaxed state, the activatable portion being arranged to deform under a force exerted by a consumer to pass into an activated state and to have a convexity oriented in a direction opposite to the first direction, a pressure exerted by the liquid on the bottle (11; 11A; 11B) closed with the activatable portion in the relaxed state being lower than a pressure exerted by the liquid on the bottle (11; 11A; 11B) closed with the activatable portion in the activated state, the body of the bottle (11; 11A; 11B) having a thickness within a range from 30 μm to 150 μm, wherein the activatable portion forms a bottom of the bottle (11; 11A; 11B), wherein the activatable portion is rounded outwards in the relaxed state, and wherein the activatable portion is arranged to remain in the activated state or in the relaxed state as long as a pressure is not exerted by the user to change state, characterized in that the bottom has at least one radial groove which extends over a length of at least 10% of the diameter of the cylindrical part of the body. the bottle (11; 11A; 11B) comprising at least one activatable portion with a concavity oriented along a first direction in a relaxed state, the activatable portion being arranged to deform under a force exerted by a consumer to pass into an activated state and to have a convexity oriented in a direction opposite to the first direction, a pressure exerted by the liquid on the bottle (11; 11A; 11B) closed with the activatable portion in the relaxed state being lower than a pressure exerted by the liquid on the bottle (11; 11A; 11B) closed with the activatable portion in the activated state, the body of the bottle (11; 11A; 11B) having a thickness within a range from 30 μm to 150 μm, wherein the activatable portion forms a bottom of the bottle (11; 11A; 11B), wherein the activatable portion is rounded outwards in the relaxed state, and wherein the activatable portion is arranged to remain in the activated state or in the relaxed state as long as a pressure is not exerted by the user to change state, characterized in that the bottom has at least one radial groove which extends over a length of at least 10% of the diameter of the cylindrical part of the body.