A cap and seal system for a liquid medicament container. The system comprises a cap formed from a substantially rigid material, and has a retention component integrally formed therewith. A seal is formed from a material which is less hard than the cap and positioned within the cap such that, when the retaining component retains the cap on a container in use the seal is positioned such that it forms a fluid tight seal between the cap and the container. A recess is formed in the seal through which a liquid outlet channel can pass in use to access the contents of the container via the cap and the seal.