The disclosure is directed to a package for containing a plurality of substantially rectangular assay plates, each plate having a peripheral flange. In one embodiment, the package comprises a cavity having extending therein one or more sloped buttress elements spaced across at least a portion of a top corner, and one or more adjacent protrusions extending from the bottom and at least partially up one or both sidewalls, each set of protrusions forming grooves therebetween into which fit the flanges of respective assay plates. The package can comprise a transparent polymer through which product information located on the assay plates can be read or scanned.