I used to get that too. And, some neighbours put their recycling in my bin. That's usually not a problem. But, every now and then, here in DDO, they forget to pick up the recycling. I don't want to bring other people's recycling back into my house. Thankfully, we now have large curbside bins.

What I did was to never crush or flatten anything that went in recycling. The object of that was to have a bin too full for other people to use.