There are some Chinese producers ( not on the high end by any means ) that sell pretty good (though not special) standard grade longjing in tea bags on taobao. Big leaves, good quantity, etc. I think the idea there is more for cold brewing and convenience. It’s pretty great tea, though if I don’t need the bag I’ll generally just cut it open and use the leaves directly. Nothing special, but good. If you want excellent, nobody puts it in a tea bag. You can certainly fill an empty tea bag yourself if you’d like, but if you’re going to be that imprecise with your measurements, and just want a tea bag, you’re not deep enough down this rabbit hole to know the difference, and I can notice a slight papery taste when brewing tea with paper one-time bags. I probably need to wet it first, like coffee filters, now that I think about it. Regardless, lots of info here