Not sure if this thread is still active, but I'll be making my first trip to the Canadian Rockies in late August. Never occurred to me that my 30 degree bag (Marmot Plasma 30) might not be enough, but as I read trip reports to where I'm headed, and see pictures of snow, I'm not sure anymore. I'll be in Jasper National park camping at 7,000-something feet. Anyone have an opinion? Do I need more?