A Fuel Can (aka Gas Can) is a portable storage container that is used by different governments and organizations to store fuel.
When Cate Archer was attempting to infiltrate a Soviet Army base in Siberia, she discovered that her Snowmobile was out of gas. Mischa informed her that there was a small Soviet outpost nearby and that there may be fuel there. When Archer arrived, the Fuel Can was behind a gate with a lock. She used the Hairspray Welder to gain access to the Fuel Can.
Gas-Can on Wikipedia