That's kind of what I'm thinking about doing. I have the 3lb protein jugs that I've taken the labels off of.
I'm gonna fill it up, use clear tape to tape the top on and probably throw it in a black trash bag among other trash (just nothing containing my name, or address, more like food trash). There's an apartment complex up the road from me that has dumpsters on the side of them.
My biggest concern is they're doing huge undercover operations in town doing drug busts, and I'm afraid if the wrong person comes across like 100 used syringes they're gonna wonder what's up and do some checking for fingerprints.