Quoted from Whysnow:I put them in a large heavy duty garbage bag, then tap the corner with a hammer or anything really. It take very little to shatter a piece of tempered glass by taping on the edge.
Then the small but heavy bag of glass goes in the recycling can.
I do the exact same thing, but drop the first "smasher" bag into another bag to make sure all the tiny pieces stay where they belong. I tried to just "put 2 sheets out to the curb" a while back ... got back that evening after work and saw a thousand pieces of tempered glass in the road outside my driveway. I'm guessing the guy grabbed the sheets and tossed them into the open back of the truck and then got a shower as they exploded both into and out of the truck.
Took me over an hour to clean it up. Never again!