Type I safety cans are specifically engineered cans that are designed to contain hazardous liquids in a way that reduces the likelihood of explosion. Unlike a Type II can, Type I cans have only one spout, which is used for both pouring and filling.
Safeopedia explains Type I Safety Can
Safety cans are designed to hold no more than five gallons, and are usually made of high-density polyethylene, which is known for its strength. Safety cans are equipped with a spring-closing lid and spout cover, allowing for the release of pressure if the can is exposed to fire. They are designed to hold flammable and combustible liquids and reduce the risk of explosions.