Pelican's Pelican-Hardigg Inter Stacking Pattern (ISP) cases are designed to stay secure in transit with patent-pending "wave design" stacking ribs on their lids and molded in-discs on their bottoms that work to lock the cases together in a stack.
The integrated wave design also allows for cross-stacking across all six ISP case sizes and enhances their rotationally molded polymer construction's load-bearing properties.