Snow_Dog wrote on May 4^th, 2010 at 1:26pm:

Android wrote on May 4th, 2010 at 1:15pm: I just bought two Gander Mtn. brand synth. bags rated at 40 deg. From what I'm reading in this thread this may be too light for my end of May trip this year. Should I return these and go for the 20 deg. ?  :-/ You'll survive in what you bought.  Depending on what you wear to bed, you might even thrive.  However, assuming typical late May weather, there's little doubt you'll be be more comfortable in a 20 bag than in a 40.

Agree.  Though if this is your one & only bag you'll be sweaty in summer or chilly in spring/fall depending on which way you go.

What you wear to bed on the cold nights makes the difference.

Since it's down, try to avoid the clothes you wore that day.  Moisture in your clothing will end up in the bag.  I'm a big fan of dedicated bedclothes & will pack a comfy fleece onesie, complete with back-door, for chilly nights on early/late season trips.  Saving up for a merino wool set.