[pct-l] sleeping bag for 2

[TempeMIke at aol.com (TempeMIke@aol.com)]

My wife and I are planning a JMT hike this August and in an effort to  
lighten the pack i am considering modifying a single rectangular sleeping bag to  
accomodate two people. I am thinking of using nylon fabric as a base and draping 
 the open bag on top of us. I will  install a zipper on the nylon so we  can 
zip ourselves in but still either of us will be able to zip or unzip our  
side. I am using a synthetic 30 degree bag and closed cell foam 3/4 length  
sleeping pads. My questions: has anyone done anything like this? will we be warm  
enough at high altitude in the Sierras? My feeling is that a 30 degree bag is a  
little light but with 2 bodies it should compensate.  I know we could get  
close to the same weight with 2 down mummies but I can't stand sleeping in a  
mummie bags. Also we will be using a Henry Shires squall 2 tent. Any comments or 
 suggestions are welcome