The Big Agnes Cross Mountain +45°F synthetic bag is the ultimate rectangular bag for space-conscious, warm-weather hikers and travelers.
Good East TN May thru Sept bag
Pros: Packs Small, Versatile, Lightweight, Roomy, Comfortable
Cons: Inaccurate Temp Rating
Best Uses: Backpacking, 3 Season Camping
Describe Yourself: Casual/ Recreational
Was this a gift?: No
Used this bag the first weekend I had it paired with a BA Insulated AC. Temps were predicted to get down to 59 with reasonably high humidity, so I figured this was the perfect opportunity to give it a try. However, I woke up around 6AM to a tent saturated in dew and 51 degrees.
Although I was not uncomfortable during the night (I had on a light base layer and Smartwool socks), I could tell that I was nearing the limit for this bag. The area of primary concern was in the foot box area, however I just threw a light fleece over my feet and all was well again. I consider myself a mildly cold sleeper, but would probably rate this bag as a 50 degree bag.
Before making this purchase I was looking at the Therm-A-Rest Tech Blanket (~55 deg) paired with a light fleece liner to achieve the 45 degree mark. I think this bag was a much better purchase. It packs down unbelievably small (7" dia x 6") and is incredibly roomy with a draw string at the top to reduce heat loss.
One additional selling feature was the fact that I can use it as an overbag for my 30 degree bag to extend it's comfort rating by another 20 degrees while still featuring that comfortable BA integrated pad sleeve design.