This is an interesting and useful thread, I have about 6 of the old metal "Gerry cans" that are in my old barn on the other side of the farm. I used them for years with no ill effects, however, I much prefer the plastic cans as they are lighter, easier to load and unload from the truck and don't rust! Also, the spouts are cheaper. However, the new and improved &*&% spouts required by the EPA (Exraordinarily parsimonious A**holes) are the most insidious spouts for the plastic cans I have ever used! These things break easily, leak, cost a small fortune, and generally don't work worth a crap! I transport my diesel in a 50 gallon transport tank in the back of my pickup and also the non-ethanol polluted fuel for my plane in the same type of tank. However, the fuel for my lawnmowers, weedeaters, chainsaws, etc. I use the 5 and 6 gallon plastic cans. You have to be careful with these cans as they can generate a static charge in certain situations, particularly when used in conjunction with Mr. Funnel. I tried to order some spouts that were of the old genre, that are now only available on water cans, but have not been able to find them. I have enough of the older plastic cans that it is merely and inconvenience now switching spouts, but as some point I will be forced to accept and utilize the new and disimproved, EPA required spouts. End of rant, I feel better!