The invention relates to a fluid reservoir (1, 100, 330, 400) which is attachable to an aerosol generation device for guiding a fluid from a fluid container (16, 116, 300) to the aerosol generation device. The fluid reservoir has an interface portion (2, 102, 202) arranged at the fluid reservoir for attaching the fluid reservoir to the aerosol generation device. The interface portion has a locking element (8, 10, 12, 14； 110, 114； 210, 214) configured to non-detachably lock the fluid reservoir to the aerosol generation device after attachment of the fluid reservoir to the aerosol generation device. The locking element is breakable to enable detachment of the fluid reservoir from the aerosol generation device. Further, the invention relates to a combination of the fluid reservoir and a primary fluid package (250), wherein the primary fluid package has at least one chamber (252, 254) containing a fluid therein. The invention also relates to an aerosol generation device which is configured for use with the fluid reservoir. The aerosol generation device has an attachment portion (52, 152) for receiving the interface portion of the fluid reservoir.
