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

• Sold in 3 sizes to meet the demands of any stove or trip
• 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
• Measures 4.4 x 4.4 x 6 in (11.1 x 11.1 x 15.24 cm) and weighs 23 oz (652 g)