I need gloves in my area, I'm never sure about some of the liquid left in some of these drink containers and there's always slimy Macca's wrappings -_- I'll pick up some things sometimes if they look dry enough to handle because I don't carry gloves around. Would definitely give a nice motivation to your runs if you needed more motivation XD
I think my area is less dense and people just discard their containers out of laziness.
It would be problematic if the cans were used for storage, urine etc ...