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.
USDOT regulations require camping fuel to be shipped using surface methods (trucks and boats) only. We ship all in-stock orders within one business day.