...Since you probably will be sleeping intents with a bottom you won't really need a "cold" sleeping bag (ones that are rated for low temps)...
So what are we talking about? Would "40 degrees" be sufficient you think?
How about
this one?
SAR tells me to just wrap myself in all my clothing and an emergency blanket and just deal with it. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> We generally can't carry tents and Mt. Hood can be quite cold. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />
However, that sleeping bag would definitely work well. The tent, as DA stated, will help retain warmth.
If your worried about really cold climates but want to travel light, you can get a light sleeping bag and a sleeping liner.
