MSR IsoPro is a performance-boosting, 80/20 blend of isobutane and propane, with the purest isobutane (5% or less n-butane) of any canister fuel. This clean-burning formulation maintains higher internal pressure at lower temperatures than standard butane/propane mixtures, delivering superior cold weather performance and more consistent output over the life of the canister.

 WARNING: Cancer and reproductive harm

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• Three Sizes: Sold in 4, 8 and 16 oz. canisters to meet the demands of any stove or trip. The 4 oz. canister is sized to fit inside the 1.0L WindBurner® and Reactor® Stove Systems.
• Improved Performance: 80/20 blend of isobutane and propane delivers superior performance throughout the life of the canister and in colder temperatures.
• Clean-Burning: Zero-maintenance combustion.
• Fuel Gauge: Built-in float gauge determines how much fuel is left (4 oz. and 8 oz. canisters).
• Recyclable: Consult your local recycling center for regulations.