| CPC B65D 25/107 (2013.01) [B65D 43/162 (2013.01); B65D 43/163 (2013.01); B65D 85/44 (2013.01); B65D 2543/00296 (2013.01)] | 8 Claims |

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1. A method of packaging comprising:
assembling an assay plate package, said assay plate package comprising a cavity defined by a top panel comprising peripheral top sidewalls, and an opposed bottom panel comprising peripheral bottom sidewalls;
a plurality of sloped buttress elements extending into the cavity and spaced across at least a portion of an inside edge where the top panel meets a respective top panel sidewall;
a plurality of protrusions extending from respective bottom sidewalls into the cavity with adjacent protrusions of the plurality of protrusions forming a respective groove; and
a stack of nested assay plates, each plate comprising a flange and an assay plate outer side wall, the assay plate outer sidewalls of adjacent flanges each forming a slot, wherein the flange fits into the respective groove, and a sloped surface of one of the sloped buttress elements of the plurality of sloped buttress elements fits into the slot, and wherein the flange of each assay plate is oriented perpendicular to the top panel and the bottom panel;
stacking said assay plate package on at least one other assay plate package which is in a closed position; and
placing said stack into a shipping box.
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