Unit-load handling remains highly relevant even in an each-picking-dominated world and may be more important than ever because it minimizes touches while integrating reserve storage with order-selection processes. System suppliers are responding with creative configurations and equipment—shuttles, AGVs, and AMRs—that enable practical unit-load flow both inside storage systems and across the floor. Users prioritize system uptime, flexibility, redundancy, and cost; these can be achieved simultaneously.
Demand for unit-load systems is expected to remain strong for at least the next three years as projects delayed in 2022–2023 catch up. Unit-load solutions and handling techniques continue to advance. Selecting the right system requires focus on the facility’s value streams: full-pallet handling only, layer picking for rainbow pallets, or case picking all influence design.
The majority of installed unit-load AS/RS still use single-deep rack on each side of an aisle served by one storage-retrieval machine (SRM). Double-deep or multi-deep configurations increase density, with low-profile shuttles carried by the SRM into deep lanes to retrieve loads. Throughput limitations of single-SRM aisles are being overcome by independent pallet-shuttle systems that travel within the rack structure, often multiple shuttles operating concurrently to create parallel pickup-and-delivery streams.
Pallet shuttles store, buffer, and sequence products between bulk stock and downstream functions such as production, order fulfillment, and shipping, dramatically raising speed, density, accuracy, and throughput. Some designs (for example Movu) allow shuttles to move between levels via elevators, enabling dynamic reassignment according to demand. AMRs and AGVs further extend flexibility by handling floor transport outside the rack, often under the same fleet-management software that prevents collisions and links to WMS or manufacturing systems.
Software is critical for directing movements in line with orders, condition monitoring, and rapid issue resolution; artificial intelligence is expected to enhance predictive maintenance and uptime. Additional configuration options include using storage lanes for inter-area transport, multiple drop-off points based on proximity, inter-aisle transfer lanes, integrated sub-aisles for slow movers, shipping buffers/sequencing, and dynamic lane-depth/virtual configuration. Case examples illustrate the range: Anheuser-Busch’s Columbus brewery employs seven dual-load SRMs serving nearly 13,000 pallet positions at 680 pallets per hour, supported by 40 AGVs that stage loads for wholesaler trucks so that inventory turns every two days.
A European 3PL uses 20 Movu shuttles across 45,000 locations to achieve 11,000 pallet movements per week, with dynamic level reassignment and delivery to mezzanine value-added and piece-picking areas. Unit-load handling is therefore not diminishing; it is expanding in capability and optionality, giving operators more ways than ever to minimize touches, raise density, and maintain high uptime.