The protecting body for a flexible pouch is specially designed to contain a biopharmaceutical fluid. It includes two substantially planar plates which respectively form a lower surface and an upper surface and which are fixed to each other. The two plates are able to sandwich the flexible pouch for constraining the flexible pouch such that the protecting body is substantially planar, and includes, on a peripheral side, at least one opening able to receive at least one port of the flexible pouch.