Review on Wavian USA JC0010BLVS NATO Jerry Fuel Can and Spout System - Authentic Blue (10 Litre) by Daniel Aboubakar

Plastic is dangerous and gives off fumes. The metal is harmless and will turn black even in direct super hot sunlight, 110 degrees plus heat, it is designed to expand in these conditions. READ THE OFFICIAL OSHA/EPA FUEL STORAGE GUIDELINES. A filling of 85% to 90% is recommended to ensure proper expansion. DO NOT keep "as full as you can" is an old wives tale. Due to fumes, pressure is always generated, filling the bottle completely only limits the design of the bottle. A low level is also not recommended. As Army Airborne Rangers, we tested these little metal cans on special missions in the desert. Now I trust them hanging out under the sun on my Jeep in Southwest Florida. Incidentally, filter the fuel from the initial fill/fill cans to ensure there are no flakes of paint/sealant in them.