I understand the Dromedary bags are not specified for fuel by the manufacturer like Giant Loop fuel bags but those fuel bags are not technically road legal in the US either. The MSR bags being significantly less expensive makes them very tempting. Do the official fuel bladders give extra value for the extra cost? What is the down side of using the MSR? I'm guessing getting fuel in and out of the fuel bags is easier than the MSR since its not made for putting stuff in a gas tank or filling at a station. Iv read the the MSR bag always let off fumes and some times sweat fuel. Do the fuel bags do this or can you put the cap on the emptie and toss it in a pannier with out it making everything smell like gas?