The Mary Mountain route is my goal for this year. I heard about many beautiful places on this route, so I think to stay there for the night, I'm afraid that the nights there will be cold, since the route lies along the river as my friend told me, and I have a summer sleeping bag and calculated for +9 degrees celsius. I was thinking about buying a new warmer and lighter sleeping bag called the Kelty Cosmic Down 20 Review. It was advised to me by a friend of mine. And also I read an article that this sleeping bag is one of the top ones, here is a link to this article https://theoutdoorsman.org/kelty-cosmic-down-20-review/. If any of you have used or is using this sleeping bag, then I would not mind hearing your opinion about this bag. The rest of my equipment is in complete order.