The Vase is the last of three domestic tournaments that form the CRFU Tri Championship which was introduced in 2008.
The Vase is played over two rounds at the end of the Alex Alexander Memorial Trophy when rankings have been finalized. The team in 1st place plays the team in 4th place and the team in 2nd place plays the team in 3rd in a straight knock out.
The winners play off for the Vase. This is the last domestic XV a side game of the season.