[pct-l] sleeping bags

[Steven.Setzer at Colorado.EDU (Steve Setzer)]

I know this is kind of arbitrary and has probably been talked to death
before, but I'm wondering about sleeping bag ratings.  I've been looking
at the lightweight Marmots and Feathered Friends.  The Marmot bags seem to
be a bit lighter so I'm leaning towards those.  Anyway, there's a 30
degree bag and then a 15 degree and I can't decide which to get.  I can't
afford to have different sleeping bags for different sections of the
trail and all the one's I own currently are not so lightweight.

So is 15 degrees overkill?  Or is 30 degree pushing it?  I tend to sleep
on the cold side so I would lean towards a warmer bag.  But I'm not sure
if 15 would be way too warm for much of the PCT.  Feathered friends has a
20 degree bag but its the same weight as the Marmot 15 so I'm considering
them to be comaparable.

What do y'all think?  I know this varies from person to person but I'd
like a general idea of what people have done in the past.

Steve