"This is a quality big agnes product at a great price!"
I wasn't so sure abut a tandem sleeping bag at first. However, after receiving my king solomon I was surprised at how well it compressed in my pack and the overall quality of the bag. After a two night hike I was again surprised by the warmth and plenty of room for two to stretch out. I can't vouch for the 15 degree rating as it was in the 30's but I am confident it would be warm enough for the rated range. The sleeping pad sleeves are a nice feature to keep the bag on your sleeping pad. I'm 6' and we still had enough room for a beagle to sleep in the bottom of the bag. Great bag if you have a cute hiking partner to cuddle after a long hike or a great way to make new friends on the trail.