DOLADISPLAY's stackable refrigerator tray system optimizes vertical storage through precision-engineered interlocking technology. The patented StackSecure design features graduated rim profiles that create positive alignment with 2mm tolerance, preventing dangerous shifting during transport. Weight-distribution pillars transfer loads directly through the stack (capacity up to 200kg per column), while ventilation channels maintain proper air circulation. Ergonomic handholds at multiple levels facilitate safe handling when stacked, and color-coded edge indicators prevent mixed SKU stacking errors. Specialized versions include: nesting models for space-saving empty storage, roll-out tray systems for accessibility in deep units, and security-locked configurations for controlled substances. The universal stacking geometry works across all DOLADISPLAY tray families, allowing mixed-material stacks when required. All stackable trays undergo rigorous stability testing including seismic simulations for pharmaceutical applications.