This rack is useful for safe transport and incubation of 100mm Petri dishes and helps to streamline benchtop sample processing. Each rack holds up to forty-two Petri dishes with lids, configured in six columns of seven plates. The base area is large enough to be stable but small enough to preserve bench top space. Up to four racks can be stacked together, and all interlock to prevent an accidental knock over. Access slots under the bottom Petri dishes allows a stack of dishes to be safely removed from the rack using a secure grip that places a finger under the bottom dish and thumb on top of the lid of the top dish. A large center divider provides space for labeling and incorporates a handle that does not interfere with the samples. To maintain sterility and ensure long-term performance, all parts are molded with white polypropylene and are steam autoclavable at 121°C (250°F). Racks are shipped flat and can be easily assembled. Overall dimensions are 33L x 21W x 17.8H cm (13L x 8 1/4 W x 7”H)