I also use fabric bags, most of which were acquired at no-extra-cost when purchasing other things. Some are quite HD and I expect they'll last a decade or more

I also use fabric bags, most of which were acquired at no-extra-cost when purchasing other things. Some are quite HD and I expect they'll last a decade or more. But, some are quite flimsy and not something I would purchase on its own. 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.