Abstract: A consumable cartridge is provided in connection with an inhaler device 10. The consumable cartridge includes a casing defining a cavity, the casing having a first region and a second region. An elastic bladder is located within the cavity of the casing and encloses a vaporizing liquid. The first region of the casing includes a pierceable portion, and the second region includes a pre-perforated portion. The bladder is disconnected from the casing in the first region, and is configured to rupture or to be cut when it is pierced by a piercing member of the inhaler device such that the ruptured or cut area of the bladder creates an opening which is significantly larger than the cross sectional area of the piercing.