Originally Posted by FLRider
This may seem like an odd question, but how thick is the back padding on your pack? If it's within the same range as the pad you were thinking about taking anyway, well...
41 isn't that cold (at least, it isn't for me); I think I'd be able to get away with using my pack (which doesn't have any padding along the back; it's just two layers of 1000d Cordura) as a pad for my legs as long as I had long sleeping pants and decent socks (which are something I'd carry anyway for trips below 50 F). Note, though, that I'm a particularly warm sleeper.
Anyway, it's just a thought.
I own a Gossamer Gear Mariposa 2012 pack. It's got a pad in it, but I'm planning on leaving that pad that's supplied with the pack in it's place. I could use my pack if worse to comes to worse and I find the 3mm foam not warm enough. I prefer not having my feet all over my new pack. I only purchased this pack last week. I nice pack to I must say, it's only 750grams.