I'm curious about something. Do the bags sold for straining fruits and vegetables have tags on them that state they are food grade? I've got a straining bag I bought years ago from either Midwest Supplies or Austin HB...no tag of any kind. Is it that just because a bag is sold at a food-canning/beer-wine-making/etc store that it is deemed food grade...without a tag on it, just packaging stating it?
We've all got our comfort zones with different things. Sometimes we have to step out of that comfort zone, but I don't think this would be one of those times. Use whatever strainer bag that you feel good about using. Personally, I'm a bit skeptical that the food strainer bags are not simply repurposed paint strainer bags or at the least sewn together out the same mesh that some paint strainers are sewn from. But, peace of mind from having someone tell you that it is food-grade could be worth a small premium over a Lowe's paint strainer bag you pull off a shelf. We do not see "food grade" emblems on plastic forks and spoons or toothbrushes, either, and most of us will use them without much thought. And, then there's the water mains that deliver water to us...we know they're supposed to be food grade but it's really hard to see beneath the ground so we take "somebody's" word for it that they are indeed food-grade. It is what it is...to each his/her own.
And, no, there was no one that saw a tag on a strainer bag, I jokingly commented about it, but again, there was no tag on a bag that I've seen.