An aerosol-generating system is provided, including: an aerosol-generating device configured to heat an aerosol-forming substrate; and an exterior sleeve, the device including a device housing and a plurality of internal components contained within an interior space enclosed by the housing, the housing including an external surface and at least one bent or bendable portion, bent or bendable into or towards the interior space to interact with one of the internal components, and the exterior sleeve covering the at least one bent or bendable portion. A kit including the aerosol-generating device and at least one exterior sleeve, and a method of manufacturing an aerosol-generating system, are also provided.