Sierra Designs Zissou 12

Great backpacking bag.

I've been camping for 15 years, but this is my first serious backpacking bag and it crushes all my expectations. The cheap mummy bag from the big box store wasn't cutting it anymore.  I haven't tested it down to its rating yet, but it was very comfortable down to around 30 degrees.  

It packs down pretty small, is very light, and I can sleep comfortably without a shirt. I like the foot vent also. I've only taken it on two weekend trips so far, so durability remains to be proven.

Overall, very happy with this purchase. Ultralight backpackers might be more picky on the specs, but made my budget happy too.