A flexible container for storing a liquid medicament comprises a container wall consisting of two wall sheets of flexible material that are sealed together is disclosed. The container may comprise a storage compartment for the liquid medicament, and an access opening on one of the wall sheets. The storage compartment and the access opening may be in fluid connection. The access opening is designed to be fluidly connected to an outer conduit system. An insert part may be arranged between the two wall sheets with positive locking, and may fluidly connect the storage compartment and the access opening.