The patented (pending) Bulk Storage Grid Box design has a pocket with 12 slots that are optimal for cradling 12 autogrids - an entire cassette of autogrids in one grid box. Furthermore, for those comfortable storing unclipped grids in the traditional autogrid boxes, the slots also hold unclipped grids securely. The first of its kind grid box can be used to store an entire 12-grid cassette of samples, from vitrification through to cassette loading, drastically improving storage density and sample traceability, and reducing storage complexity and grid box inventory requirements. Furthermore, these boxes are made with a highly opaque plastic, enabling optimal visualization of grids in the pocket under LN2. The 6 available colors and the permanently, laser-marked, one-of-a-kind serial numbers also provide easier sample traceability. This grid box works with either the NanoSoft Pin Lid or the FEI/Thermo Fisher Scientific Pin Lid.