I have never taken a beer into the woods but have brought countless empty cans/bottles out. Seems to get worse every year though.
I missed a chance at an elk a few years back... I stepped over a can, then went fifteen or so yards back to get it, about fifty yards farther down the cat road, I heard elk coming and they crossed, and stopped just out of range. Had I been thirty yards closer, I would have put an elk in the freezer that year.

I did not see a single piece of garbage, or another hunter for that matter, on two pieces of State land that I hunted this year.