Portable gas can rant, and a really good solution

The old style cans are very easy to use, but they are not spill-proof. So these new No-Spill things actually seem to be an improvement, especially when you can't see into the tank you are filling.

If you go onto their site and sit through the longer video (three minutes), the spokes-model explains how the no-spill function works, even when you can't see what you are filling.