BROWN CORRUGATED STOCK BOXES CLICK on the image to see details and available sizes! Regular Slotted Containers Corrugated 200# Test, Brown Outside (unless otherwise noted) Pads and Sheets 32 ETC (Edge Crush Test), Singlewall C Flute, Brown Self-Locking Record File with Lid Corrugated (Die-Cut) 32 ECT (Edge Crush Test) Singlewall, Brown