What a great idea! This sleeping bag design not only saves weight as compared to conventional designs but it also ensures you will never roll off of your sleeping pad and onto the cold ground. There is plenty of room in this bag so you don't get that constrained feeling. The Cross Mountain was the perfect all around choice for me. Great in warmer weather and If the temps get to cold I just add a liner. Big Agness is a winner.

I've used this bag down to 20F by placing my outer jacket and other clothing on top. It did the trick and stayed put even though I tend to roll over during the night, which is the main reason I purchased it. Also works well when it's hot. This is the first time I've slept in a bag that stays put!!! Great product, very well built and designed.

I just got back from a hke on the AT in TN/NC. It was chilly but the bag itself was cozy and warm. I needed to pull the drawstring to keep the cold air from coming into the bag and the clip thing broke right off. I couldn't find it in the morning so the rest of the hike I held it tight with my hand until I fell asleep. Fortunately it warmed up a bit and I didn't need to snug it up. Any chance I could get you to send me a drawstring clip?

My wife and I have been using non-zipping ultra light down bags for summer backpacking. They were great from a weight perspective, but restrictive of movement, often too warm, and didn't zip together. The Big Agnes bags solved all of those issues with only a small weight penalty. Although we had avoided getting the down bags wet, we often do overnight canoing where there is always the possibility of wet gear. The Polargard Delta would also be a big plus in that situation. Several other benefits are icing on the cake... the Cross Mountain is large enough and has interior attachments that allow it to be used as an outer bag with our down bags in colder weather, and the bottom sleeve for the mattress is an awesome design feature as I was always sliding off. (Note: This bag is intended to be used with a mattress or pad as there is no bottom insulation)

OK, as much as I wanted to give BA a 5 rating, I can't based on use with a cot. I was camping in Eagle Cave, WI with the scouts...52 degrees and a very muddy floor...thus the reason for the cot. First night I got cold and had to slip on some extra clothes...not a big deal, but I was hoping the 40 degree bag would keep me warm at 50 degrees, even off the ground.