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I've tried it, they swell.
 

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Apparently you don’t understand that liquid also expands as it is heated.
Yes, very little compared to vapor. I don’t put mine or any gas can out in the sun though.

Fully filled Rotopax properly placed “in” the car (out of the sun) will not expand
 

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If only they didn't market them to be mounted to the exterior of the vehicle :rolleyes:
 

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Yes, very little compared to vapor. I don’t put mine or any gas can out in the sun though.

Fully filled Rotopax properly placed “in” the car (out of the sun) will not expand
This is from Rotopax's website:

PLEASE ALWAYS REMEMBER TO VENT THE FUEL PACK ONCE PER DAY IF THE ELEVATION OR TEMPERATURE CHANGES SIGNIFICANTLY.

THE BASE LINE REQUIREMENT FOR VENTING YOUR ROTOPAX IS AT LEAST ONCE A DAY OR EVERY 10 DEGREES IN TEMPERATURE CHANGE AND EVERY 1,000 FEET IN ELEVATION CHANGE, AS YOU USE YOUR ROTOPAX YOU WILL LEARN MORE OF WHAT IS REQUIRED DEPENDING ON YOUR LOCATION AND NEEDS. IN SOME CASES YOU MAY NEED TO VENT MORE THAN ONCE A DAY. USING YOUR ROTOPAX IN ARES WITH HIGHER HEAT AND ELEVATIONS WILL REQUIRE MORE ATTENTION. TO VENT YOUR ROTOPAX YOU WILL JUST NEED TO LIGHTLY UNSCREW THE CAP TO ALLOW THE ROTOPAX TO "BREATHE".


I wonder why they specifically tell you to vent it every single day or when the temperature changes :unsure::unsure:
 
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The 2 gallon under the passenger seat was the other option I was considering. Just wondering if the cap may leak since it will be laying on its side
Mine has never leaked. Even if it does leak it is going through one of the 10 million holes in the skid plate. Those Rotopax are really tough.

Have you looked at the Giant Loop fuel bags? Another good option

 

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Mine has never leaked. Even if it does leak it is going through one of the 10 million holes in the skid plate. Those Rotopax are really tough.

Have you looked at the Giant Loop fuel bags? Another good option

what happens if it leaks while you are upside down or on your side?
 

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what happens if it leaks while you are upside down or on your side?
Not going to leak on anything that will spark a fire. Those rotopax are pretty tough. I have not had an issue with mine on the floorboard or under the passenger seat.
 
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Yes when it is really hot out the rotpax will expand some. Not enough to worry about it rupturing. I keep it on the floor board or under the passenger seat. Never in the direct sun.
 

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I would take a fuel tank on the cage over a fuel tank inside the passenger compartment (which is illegal on most road vehicles for a reason).
 
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