What is the difference between crochet cotton and fingering weight yarn?

Question

I found a pattern for crocheted string bag (like a shopping bag) but can't figure out what fingering weight yarn is? Can anyone help me?

Answer 1

Doesn't matter.  All you need to do is make sure the 2 are the same thickness.  Exactness won't count because it doesn't have to "fit" something.  It's just a bag.

My only thought is that a poly would be more parctical than cotton.