22# is great for two sided printing. I do a lot of booklets that must be mailed. I can mail 8 pages plus cover for 61 cents. 24# needs an added 17 cents and 20# bleeds through. Fine paper for what I need!!!
I use this paper for all my School reports and homework. It is the strongest and the best. I've used some others and they just don't compare. I love it.