An object processing system is disclosed that includes a vertical structure extending in a vertical direction and at least one automated mobile carrier adapted for movement with respect to the vertical structure. The at least one automated mobile carrier includes a carrier base portion including at least two wheels for moving the automated mobile carrier in at least one direction that is generally orthogonal with respect to the vertical direction, a carrier upper portion for receiving at least one object thereon to be moved by the automated mobile carrier, and an elevation system for lifting the carrier upper portion of the automated mobile carrier with respect to the carrier base portion of the automated mobile carrier such that an engagement system of the carrier upper portion engages the vertical structure.