The smaller LP canister contains the equivalence of approximately 0.5 liter of methylated spirits, sufficient to boil about 15 liters of water. The canister is equipped with patented self sealing valves and international standard screw threads. Primus' LP gas mixture consists of 60% butane, 25% propane and 15% isobutane. Hazmat fee is $20 per case; case size is 24 units.