Years back there was a great litter prob caused from the detachable ring pulls from aluminium drinks cans.

Thankfully, the cans rings are still attached when the can's opened.

But what of the cans themselves?

I don't know which costs more to produce, given the choice of metal or plastic containers, but since other kinds of pressurised drinks are marketed in plastic, I guess of the 2, these'd lend 'emselves better to recyclability or even re-use via cleansing/refilling.

Also glass bottles could be limited for wines etc, as larger volumes are often sold in cardboard boxes.