A cartridge (2;200) for an aerosol provision system (1) comprising the cartridge (2;200) and a control unit (4), wherein the system comprises a vaporiser for vaporising an aerosolisable material. The cartridge (2;200) comprises an air channel extending from an air inlet (50) for the cartridge (2;200) to an outlet (60) via an aerosol generation region, and a reservoir (31) for containing aerosolisable material (207) for aerosolising. The cartridge further comprises an aerosolisable-material-level observation means (205) for allowing a user to observe a level of aerosolisable material (207) inside the reservoir (31). The aerosolisable-material-level observation means (205) may comprise at least one contoured surface (300) located on a surface (301;302) of the cartridge (2;200) to improve the visibility of the aerosolisable material level (207) inside the reservoir (31) due to the interaction of light with the contoured (surface 300).
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