Earlier this week I puled out of the closet my 2 yr old rei sub kilo sleeping bag.wanted to see how it fit. It was uncomfortably tight. I'm 5'8" medium build I spent most of a day surfing about sleeping bags, I noticed that most long bags are 64" shoulder girth rather than the 62" girth of regular bags. So when I went to Rei I test rode the regular and long bags, the extra 2" really made the difference. I also appreciated that I could pull the top of the bag up over my head instead of only up to my chin, heck with that mummy face hole. An extra 4 oz. So I'm a shorter person in a tall bag and like it. By the way I'm a side sleeper.