A system for the solid state storage of hydrogen comprising a plurality of hydrogen storage containers (180-216), each hydrogen storage container of the plurality of hydrogen storage containers (180-216) having an inner chamber and an inlet for introducing hydrogen gas into the inner chamber , and wherein the system further comprises: the inner chamber of each hydrogen storage container (180-216) having a solid hydrogen storage medium disposed therein; a hydrogen storage portion having an outer casing and including the plurality of hydrogen storage containers (180-216); an endplate manifold having a manifold portion welded to a first end of the outer casing , and a backing panel ; a portion having an endplate welded to a second end of the outer casing and a coolant outlet ; the manifold portion having depressed regions disposed therein that define a support ledge and a base , and a hydrogen outlet port (80-116) for each of the hydrogen storage containers (180-216) extending through the base ; and the backing panel having a hydrogen receiving port , the backing panel welded to the support ledge to form an integrated hydrogen flow channel between the base of the manifold portion and the backing panel , each hydrogen outlet port (80-116) being in fluid communication with the inlet of one of the plurality of hydrogen storage containers (180-216), the hydrogen flow channel providing fluid communication between the hydrogen receiving port and each hydrogen outlet port (80-116), characterised in that - the endplate manifold has a coolant inlet, and in that - the portion having an endplate welded to the second end of the outer casing is a hydrogen storage medium loading portion. the inner chamber of each hydrogen storage container (180-216) having a solid hydrogen storage medium disposed therein; a hydrogen storage portion having an outer casing and including the plurality of hydrogen storage containers (180-216); an endplate manifold having a manifold portion welded to a first end of the outer casing , and a backing panel ; a portion having an endplate welded to a second end of the outer casing and a coolant outlet ; the manifold portion having depressed regions disposed therein that define a support ledge and a base , and a hydrogen outlet port (80-116) for each of the hydrogen storage containers (180-216) extending through the base ; and the backing panel having a hydrogen receiving port , the backing panel welded to the support ledge to form an integrated hydrogen flow channel between the base of the manifold portion and the backing panel , each hydrogen outlet port (80-116) being in fluid communication with the inlet of one of the plurality of hydrogen storage containers (180-216), the hydrogen flow channel providing fluid communication between the hydrogen receiving port and each hydrogen outlet port (80-116), characterised in that - the endplate manifold has a coolant inlet, and in that - the portion having an endplate welded to the second end of the outer casing is a hydrogen storage medium loading portion. - the endplate manifold has a coolant inlet, and in that - the portion having an endplate welded to the second end of the outer casing is a hydrogen storage medium loading portion. <EOS>