User Review: Big Agnes Lost Ranger 15°
Design: Mummy, Long
Fill: 650 fd
Temperature Rating: 20F
Weight: Manf 3lb2oz, Act. 2lb 14oz
Price Paid: $139
Let me start by saying, Big Agnes makes some seriously tough products. I bought this bag three years ago now and have used it every chance I've had since purchase.
The bag itself is of unique (to BA) design. There is not down fill in the "back" portion of the bag. Rather, there is a pocket for an air pad of your choice (does not have to be a mattress from BA. ie; Thermarest, etc). This makes for a lighter packweight on those long, rigorous trails or thru-hikes. In that aspect, its a benefit, when it comes to keeping warm true to its rating, it can become its downfall.
I tried Thermarest, BA air mattress, and a few others, but none seemed to fully fill the mattress pocket to keep cold air out UNTIL I got my BA Insul Core mattress. Finally, the bag not only keeps me warm in its intended 20F but even kept me warm (with no additional liner) at a very cold 8F!! It's great! To anyone buying this bag, keep in mind it is down, so moisture can be an issue.
The bag's skin is water repellent but that doesn't mean water can't seep through and soak you. With proper mattress, freezing cold is no issue. And because of the design, you save weight. On warm summer nights you can ditch the pad altogether!
All in all, this was a great purchase. Very much worth the money. Hope this helps you with your purchase.