I currently use a Marmot helium bag for most of my septermber hunts, also used it for 14 days in November. I've used this bag for that purpose for the last 4 years.Here is the deal, I seem to sweat in this bag no matter the temp. I was in a 1 man tent @ 10 degres and if I kept the bag ziped up I sweat, if I unzip I freeze. This bag is very compact and light , but I'm looking for options. My old bag was a 20 degree wensel I bought @ SHOPKO , it was heavy and did not pack too small . But was way more comfortable to sleep in. Any ideas for a good Backpack bag that will breath a little ?