Plastic Shelters What Will Cut Out A Hole In A Plastic Bin?

What will cut out a hole in a plastic bin? - plastic shelters

I am a protection of wild cats two large plastic bins put together and bridge the gap between them with a kind of isolation. But he has a hole "chat" section of the two containers. I tried a utlity knife. So to me this year at The Home Depot, which are like a saw to act now to cut lines and curves. I thought it would work, but it does not appear at all.