...besides the non-flexable 'glug-glug' spouts, no vents and child proof caps the new cans are required to have a self closing flapper or pour valve.
I found this interesting. (I hope nobody thinks I'm TROLLING because I posted this information)
http://www.pfcma.com/index.php
Q: Who monitors the regulations for portable fuel containers?
A: The Industry receives oversight from a variety of sources. Portable consumer fuel containers are expected to meet federal and state statutes, EPA regulations, and ASTM International (ASTM) standards. The products of the portable consumer fuel container industry are overseen by the Consumer Product Safety Commission (CPSC). The CPSC works with various industries to develop rules or standards the industry must meet. There is also a subcommittee of ASTM International (ASTM) specifically for portable consumer fuel containers. This subcommittee works to create voluntary product standards for the industry. Additionally, portable consumer fuel containers are regulated by the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB).