AFAIK the "unsafe" cans are not available these days. However, spout kits are available on Amazon to make the "safe" ones unsafe. I know a guy who did this recentlyI need to shop for a regular, unsafe gas can. Mine has some sort of horizontal center divider in the spout that lets air travel in while gas is pouring out, and it makes for a very hard-to-manage stream, since the spout is rigid and set at a permanent, and inappropriate angle. I love dousing the outside of my mower with gas. Now THAT'S safe!
The tiny gas can I used to use for pre-mix had a plastic trigger on the spout that soon froze in place. I finally got p*ssed and squeezed it with pliers one day, and it's been an open spout ever since. Wow, are these things safe or what?