Storage container for storing product items (5; 5a) in an automated storage and retrieval system , wherein the storage container comprises: - a base ; - two first parallel side walls (6S1); - two second parallel side walls (6S2) perpendicular to the two first parallel side walls; - a top opening ; - two side openings , to allow one or more items to be unloaded from the storage container or loaded into the storage container through one of the side openings at an unloading station or at a loading station ; wherein the storage container is provided with a restraint which is arranged to restrain movement of the one or more items (5; 5a) from exiting through one of the side openings during transportation of the storage container to the unloading or loading station (10; 10a); where the restraint comprises an elevatable floor movably connected to the storage container between: - a lower position, arranged to restrain movement of the one or more items from exiting through one of the side openings during transportation of the storage container to the unloading or loading station; and - an upper position, arranged not to restrain movement of one or more items from exiting through one of the side openings at the unloading or loading station, and where the elevatable floor comprises apertures and where the storage container comprises friction increasing members positioned in the apertures, where: - in the lower position, the elevatable floor is vertically aligned with, or lower than the friction increasing members; - in the upper position, the elevatable floor is higher than the friction increasing members. - a base ; - two first parallel side walls (6S1); - two second parallel side walls (6S2) perpendicular to the two first parallel side walls; - a top opening ; - two side openings , to allow one or more items to be unloaded from the storage container or loaded into the storage container through one of the side openings at an unloading station or at a loading station ; wherein the storage container is provided with a restraint which is arranged to restrain movement of the one or more items (5; 5a) from exiting through one of the side openings during transportation of the storage container to the unloading or loading station (10; 10a); where the restraint comprises an elevatable floor movably connected to the storage container between: - a lower position, arranged to restrain movement of the one or more items from exiting through one of the side openings during transportation of the storage container to the unloading or loading station; and - an upper position, arranged not to restrain movement of one or more items from exiting through one of the side openings at the unloading or loading station, and where the elevatable floor comprises apertures and where the storage container comprises friction increasing members positioned in the apertures, where: - in the lower position, the elevatable floor is vertically aligned with, or lower than the friction increasing members; - in the upper position, the elevatable floor is higher than the friction increasing members. - a lower position, arranged to restrain movement of the one or more items from exiting through one of the side openings during transportation of the storage container to the unloading or loading station; and - an upper position, arranged not to restrain movement of one or more items from exiting through one of the side openings at the unloading or loading station, and where the elevatable floor comprises apertures and where the storage container comprises friction increasing members positioned in the apertures, where: - in the lower position, the elevatable floor is vertically aligned with, or lower than the friction increasing members; - in the upper position, the elevatable floor is higher than the friction increasing members. <EOS>