Mines actually an 11.5 liter tub version - I reckon it would hold the whole forums wasted blades for the next century! LOLI have the square version. It'll hold about 50 years' worth of blades.
I have the good fortune to be diabetic, and as such, I get a 'sharps box' for my old syringes. It's also good for disposing razor blades!
But what do you do with the box, tin, etc when it's full?