I found something similar at Michaels the other day. These are rectangular, 5 x 3 1/8 and about 5/8 thick. Top comes off, the bottom is recessed in a little bit, wasting some interior space, but creating a semi-protected area on the bottom where I put the foil from my Ritter pocket kit. Enough room for all of the stuff from the Ritter and quite a bit more. Mine has a bright red lid and satin finished metal bottom. Cost a whopping $1!!!