In General One Canister of MSR IsoPro fuel will be sufficient to boil water for two people over four days in summer. Wind, low temperatures and longer cooking times will increase fuel consumption. Transporting Fuel Carrying flammable fuel on passenger aircraft in carry-on or checked baggage is forbidden. Before transporting a MSR fuel bottle on an aircraft, safely empty all fuel from the bottle, wash inside with soapy water, rinse thoroughly, air dry, and stow uncapped. Storing Fuel Fuel degrades when it contacts air. Store your fuel in an airtight container, such as an MSR fuel bottle. Fuel Bottle Pressure MSR's stoves burn best when the fuel bottle is pressurized to 15-25 psi (1034-1724 mb). That Is Equivalent to about 20 pump strokes for a full 22-ounce MSR fuel bottle. As the fuel burns, the air space in bottle expands decreasing pressure. Check The Pressure Often And Pump To Maintain A Good Burning Pressure.