https://www.amazon.com/VP-Racing-Fuels-3512-Motorsport/dp/B003TTV972
You can still buy a decent jug. They're still made. People haul those jugs off into the middle of nowhere on off-road vehicles that get beat the fuck up and the jugs endure just fine. They're vented, the caps are really durable, and ~~they come with a nice long hose spout.~~
Amazon doesn't have the cheapest price on them, you can find them for as low as $24, but the free shipping is a plus.
Edit: I just looked further down the listing and the filler hose is extra, not included. Be sure to get one.
https://www.amazon.com/VP-Racing-Fuels-3512-Motorsport/dp/B003TTV972
VP makes a good fuel container. They also make a 10gallon version.
Go to a motorcycle shop, sport local, or Amazon, and buy a utility jug. Not a gas can, a utility jug. Also, spen the extra $5 and get the hose bender. https://www.amazon.com/dp/B003TTV972/ref=cm_sw_r_cp_apa_i_uoAoFbJXQS3QK