Question: what is 20 lb copy paper?
Answer: For example the common office copy paper Bond* has a standard size of 17” x 22″ and this is the size that is weighed for 500 sheets. If 500 sheets of this size weigh 20 lbs, then the paper is classified as a 20lb bond. Some of other weights for bond paper are: 16lb, 24lb, 28lb & 32lb.