A method for conditioning a flexible medical endoscope (10) having internal channels (12), so as to maintain disinfection of said endoscope (10) following processing to a state of high level disinfection, comprises the steps of: (a) connecting the internal channels (12) of the endoscope (10) to connectors (31-34) enabling fluid communication with a reservoir (24) of disinfectant fluid (25); (b) charging the internal channels (12) with disinfectant fluid (25) from the reservoir (24); (c) disconnecting the internal channels (12) from the connectors (31-34); (d) sealing the endoscope (10) in a pouch (56) having a substantially air-tight seal (57) and a valve (55) enabling connection to suction means (53); and (e) connecting and activating the suction means (53) so as substantially to reduce pressure within the pouch (56), thereby partially evacuating the pouch (56).