No more spilled fuel!  The UCO Fuel Faucet is a dream for those carrying tank type stoves.

The UCO Fuel Faucet fits MSR, SIGG and most other aluminum fuel bottles.  Just replace your current lid with the fuel faucet.  A quarter turn opens it to allow fuel to flow neatly from the spout without a funnel.  An air hole on top can be occluded with a finger to regulate the flow.  Then, a quarter turn back seals it closed for neat packing.  Weighs just 0.5 oz!