Hey Cyccommute, how you like the warmth of your lost ranger? I've got one too, with the insulated air core to go with it, and I've been rather cold in it at 32 degrees. I love the bag, but it's 15 degree rating is inconsistent with respect to Big Agnes's own lineup. I looked on their website, and their Mystic SL has the same cut, and has one ounce more of a higher fill power down, yet is rated at the same 15 degrees!

Great summer bag though.