A system of buffer storage and sequencing of loads is configured to receive non-sequenced loads coming from at least one external unit and to provide sequenced loads to at least one preparing station. The system includes: a reciprocating lift having a single nacelle with K levels each enabling transportation of at least one load with K≥2; at least one buffer storage unit; and a managing unit configured to organize first movements of loads from at least one inbound forward conveyor to the at least one buffer storage unit through the reciprocating lift, and second movements of loads from the at least one buffer storage unit to at least one outbound forward conveyor through the reciprocating lift.