Just a note: I too bought a large quantity of blades on ebay quite a few years ago. I have found that it's possible to put more blades in the containers then originally in there, so I took and moved all my new blades to one of the Olfa packages and marked with masking tape the empty one as used. That way I can still keep the older blades to use for cutting paper or junk stuff and have my new blades all in one place.