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I'll pry the gaskets out for some thickness checks. Thanks for the advice.
What's the best way to pressure test after making my own? I was thinking baking soda and vinegar, or maybe dry ice but not sure what these things are really rated for
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Don't overthink the pressure testing. Put a little gas in, leave in sun, do they swell? If yes, they hold at least some pressure. Now vent the pressure off, seal again then take somewhere cool, do they suck in? If so, they hold negative pressure. The final test, put the can in a hot vehicle (in passenger compartment) w/ the windows up and leave it set for 4 or 5 hours in the hot sun. Then go have a sniff in the car, any gas smells? If yes, it leaks a little under pressure, if no, it holds pressure very well.