I absolutely agree with you Sandra – I have also made thousands of morsbags out of all sorts of fabrics.
The reason I said that small produce bags didn’t count as morsbags is because, as I wrote above –
“Additionally, it needs to be fit for its purpose, and the original purpose intended was to replace a plastic carrier (tote) bag. It therefore needed to be strong enough to carry your shopping.”
Produce bags are sized to carry a couple of handfuls of mushrooms, or some apples, for example, and not weigh too much so that you’re paying apple or mushroom prices for the weight of your own bag.
I’ve made morsbags out of lovely samples of net and voile, quite thin, definitely polyester, but sized to take a big bagful of shopping. They counted as morsbags because they met the principles above.