I recently purchased three of these tanks from Amazon! I love my ribbed power pivots and ordered one to see if it would be a good dupe. They are NEARLY IDENTICAL. The one from amazon is maybe half an inch shorter and the straps don't really angle outwards like lulu's. I wear a size 8 and ordered larges. Ironically enough, the Amazon large came with a tag that was labeled with a size 8 haha