A thermal conditioning wall panel (10) for use in a thermally insulating container comprises a panel body (22) having a channel (26) formed therein along one face thereof for receiving one or more thermal conditioning elements (12). At least one foot (32) is formed at the lower end of the body (22) for engagement within a socket provided on the thermally insulating container. The panel further comprises thermal conditioning element retaining elements (40) provided adjacent the longitudinal edges (29) of the channel (26), the retaining elements (40) projecting over a peripheral portion of the channel (26) for retaining the thermal conditioning elements (12) within the channel (26).