A plug of vaporisable material for a vapour generating device which generates a vapour by heating at least the base of the plug is disclosed. The plug comprises vaporisable material 25 shaped such that it defines a cavity 26 within the vaporisable material. Preferably, the plug comprises tobacco material and the recess cavity is frustoconical. The plug fits into a capsule 20 for use as a cartridge in an e-cigarette device.
