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               Originally Posted by 
              Gas_Up_Lets_Go  
              I've been looking all over the place for a solution to this too.
              
 I've a 3 season bag, comfort down to 4c, but it's just not enough to keep toasty at the begining and end of the season. I can improve on that by adding in the silk liner, which takes a couple of C's off
 
 I was, and still am torn between a bivibag to put the bag into, or one of those bivibag come tent things, for reallllly rough camping.
 
 Any offers of advice ?
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         I know this is a bit late but i have used bivy bags for a good few years and a good goretex one will add another few degrees easily to your sleeping bag, army surplus ones should be fine if in good nick, i also use a thermarest as i went off blow up airbeds in sub zero temps and find these are better insulation, hope this (belatedly) helps, regards, Jim