Package system, comprising: a humidifier, comprising: a carrier plate with a first main surface and a second main surface opposite thereto; a humidifying element attached to the first main surface of the carrier plate, and a package, comprising: a storage compartment configured for storing tobacco or a tobacco related product; at least one closure element configured for closing the storage compartment; and a retaining element on an inner surface of one of the storage compartment and the closure element, wherein the retaining element comprises at least one first portion protruding from the inner surface in a first direction perpendicular to the inner surface and at least one second portion protruding from the first portion in a second direction parallel to the inner surface, said package system being characterised in that: a frame portion of the first main surface is uncovered by the humidifying element, and the retaining element comprises a U-shape in a plan view on the inner surface and a slot configured for receiving the carrier plate of the humidifier in a direction parallel to the inner surface, wherein the slot is formed between the inner surface and the at least one second portion, and wherein the retaining element comprises a retention element formed as an additional first portion protruding from the inner surface and extending from the tips of long legs of the U-shape towards an inner area of the U-shape and configured for engaging with the carrier plate for detaining the humidifier in the retaining element, wherein the retaining element is configured for receiving the humidifier by mechanically interacting with the frame portion, wherein the humidifying element of the humidifier received in the retaining element is facing the storage compartment and is uncovered by the retaining element, wherein an extension of the at least one first portion in the first direction corresponds to the thickness of the carrier plate, and wherein an extension of the at least one second portion in the second direction corresponds to the width of the frame portion. a humidifier, comprising: a carrier plate with a first main surface and a second main surface opposite thereto; a humidifying element attached to the first main surface of the carrier plate, and a carrier plate with a first main surface and a second main surface opposite thereto; a humidifying element attached to the first main surface of the carrier plate, and a package, comprising: a storage compartment configured for storing tobacco or a tobacco related product; at least one closure element configured for closing the storage compartment; and a retaining element on an inner surface of one of the storage compartment and the closure element, wherein the retaining element comprises at least one first portion protruding from the inner surface in a first direction perpendicular to the inner surface and at least one second portion protruding from the first portion in a second direction parallel to the inner surface, said package system being characterised in that: a frame portion of the first main surface is uncovered by the humidifying element, and the retaining element comprises a U-shape in a plan view on the inner surface and a slot configured for receiving the carrier plate of the humidifier in a direction parallel to the inner surface, wherein the slot is formed between the inner surface and the at least one second portion, and wherein the retaining element comprises a retention element formed as an additional first portion protruding from the inner surface and extending from the tips of long legs of the U-shape towards an inner area of the U-shape and configured for engaging with the carrier plate for detaining the humidifier in the retaining element, a storage compartment configured for storing tobacco or a tobacco related product; at least one closure element configured for closing the storage compartment; and a retaining element on an inner surface of one of the storage compartment and the closure element, wherein the retaining element comprises at least one first portion protruding from the inner surface in a first direction perpendicular to the inner surface and at least one second portion protruding from the first portion in a second direction parallel to the inner surface, the retaining element comprises a U-shape in a plan view on the inner surface and a slot configured for receiving the carrier plate of the humidifier in a direction parallel to the inner surface, wherein the slot is formed between the inner surface and the at least one second portion, and wherein the retaining element comprises a retention element formed as an additional first portion protruding from the inner surface and extending from the tips of long legs of the U-shape towards an inner area of the U-shape and configured for engaging with the carrier plate for detaining the humidifier in the retaining element, wherein the retaining element is configured for receiving the humidifier by mechanically interacting with the frame portion, wherein the humidifying element of the humidifier received in the retaining element is facing the storage compartment and is uncovered by the retaining element, wherein an extension of the at least one first portion in the first direction corresponds to the thickness of the carrier plate, and wherein an extension of the at least one second portion in the second direction corresponds to the width of the frame portion.