A fluid container for a medical fluid dispensing device comprises a rigid body (3) for delimiting with the inside part of its wall a volume of the medical fluid and a membrane (5) that covers at least an opening of the rigid body thereby creating a fluid tight lid the opening corresponding to a measurement area and the membrane further covers a portion of an outside part of the rigid body s wall. The membrane comprises a flexible measurement part (11) corresponding to the opening of the rigid body an attachment part (13) that is fixed to the rigid body and a second part (12) that connects the flexible measurement part to the attachment part and which comprises a rigid part (14) an upper part of which is connected to the flexible measurement part and the rigid part further comprising a sealing surface (18) and a deformable part (15) which connects the rigid part to the attachment part. The fluid container further comprises a first gap (17) located between the rigid part and the rigid body which is dimensioned to receive at least a part of the rigid part in a case when a force is applied onto the sealing surface and causes the deformable part to deform.
