Trangia Plastic Yellow Spirit Burn Bag. Besides having a track record of reliable service that spans decades it also has a couple of uniquely useful features. The simmer ring allows the burner to adjust from full to simmer and extinguishes the flame when closed completely. The twist on cap with o-ring seals the burner so you don't have to empty unused fuel between uses and prevents evaporation - less fuel wasted means less fuel you have to carry. Includes burner simmer ring and cap w/ o-ring. Features of Trangia Spirit Burner: Weight: 0.24 lbs Packed Dimensions: 2.85" x 1.75" Output: 1000 w Boil Time: 8 min (1 liter) Fuel Type: Alcohol Package Contents: Trangia Spirit Burner