I have blitz plastic gas cans I’ve been using for like 15 years. Never leaked. But I see how they can leak. The relief valves don’t work well and if you got the cap on tight it looks like it could blow the can. So I keep the cap on very loosely. Just enough to keep dirt and critters out.They are metal and stout. The plastic ones don't stand up over time. Blitz made them for a while until they started to split at the seams and got sued out of business. I threw out 3 of their plastic cans after only 4 yrs. of use.