Scott M.wrote a review of Big Agnes Hog Park Sleeping Bag: 20 Degree Synthetic on June 26, 2012
There is NO Insulation in the bottom of the sleeping bag!
Instead there is a compartment for a sleeping Pad. Their idea is that this is going to provide the warmth for the bottom of the sleeping bag. I found that even with an Insulated sleeping pad - I still FROZE! The Insulated pad seemed to provide NO WARMING QUALITY!
The sleeping bag is good in size - good size and comfortable for a broad shouldered person.
On the Top of the sleeping bag where there is the Quallofil Insulation - it is warm, however on the bottom where there is NO Insulation - VERY COLD!
Even though the sleeping bag is of good size, I still rate it LOW because of NOT having Insulation in the bottom of the sleeping bag - it causes a COLD AND MISERABLE NIGHT OF SLEEPING!