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 ...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) 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. The 4 oz measures 3.5x3.5x2.7 inches and weighs 7.4 oz, 8 oz measures 4.3x4.3x3.7 inches and weighs 13.1 oz and 16 oz measures 4.4x4.4x6 inches and weighs 1lb 7 oz.