Pelican Hardigg IS4517-1103 Inter-Stacking Pattern Case virtually elminates load movement during transit with a unique Inter-Stacking Pattern (ISP). The system is compatible across 6 different sizes from 4 to 25 cubic feet of storage. Equipped with a silicone sponge O-ring and pressure release valves, the ISP Case is impervious to extreme weather and wet conditions.The system is designed to maximize the volume of standard logistics platforms - Euro pallets, JMIC containers, 463K pallets or sea containers. The ISP Case system will make the most efficient use of cargo space.With its Inter-Stacking Pattern there is no question where the next case belongs. On the lid, unique wave-design stacking ribs add rigidity. On the base, molded-in discs interlock to the case below, even if it's a different size. The ISP system is designed to cube out perfectly across standard logistics platforms for speed and load efficiency. And cross-stacking builds incredibly tight loads that can save time while strapping and netting. This allows taller loads that won't shift or become loose from turbulent air, high seas or dilapiated road conditions.