We have only tried this in the living room so far, but it drove me crazy that there wasn't a single review when we were shopping for a "double wide!" It fits into the bottom compartment of my Gregory Deva 70. We fit 2 Exped SynMat 7s into the handy sleeping pad pockets on the back of the sleeping bag. Seems really well made and warm. I was glad the *sides* of the sleeping bag are insulated too (the bottom is not). Will be great for use in the mountains this spring where you never know what the weather will bring.