I'm using an all metal 99p money bank (from the 99p shop, but poundstetcher, and poundland all have similar products with different silly/tacky/uninteresting pictures and/or such on them), with no bung hole, just the top slot. If used for money, one would need the can opener, or to shake the coins and fish them out with a butterknife, or a popsicle/ice lolly stick, or summat; with blades, just fill it and recycle the whole thing at one go... might think about sealng off the top slot first though.