I agree that some of the lighter weight ‘cloth-like’ bags made today would not be able to stand that duty cycle.
Might be better overall still, but that's the direction it goes in.
I use soapberries, have a well, and have a sewage treatment plant here. My electricity is hydroelectric.
How is me washing anything affecting the planet negatively in the slightest bit?
After the sewage gets treated it goes into a field with wild vegetation which is home to all kinds of living, breathing, and pollen[ating] things.
I suspect that HD hemp bags (or some other blend of material) are the best option, but finding a definitive answer isn't easy. It appears the lighter cotton bags need to be used for two decades to account for the cost of farming the cotton - and many won't last that long before they begin to fail.
Links to two studies which place the number of times you must reuse a cotton bag between 130-7100 times.