Hello!

I'm heading to Harper's Ferry in early May and going North from there. I tend to get hot easily (and have a lot of natural insulation) and the sleeping bag I have right now is really overkill. It's enormous and strapped on the back of my bag, it weighs 5 pounds and it's 0 degree. I'm also concerned about keeping that thing dry. I want to get a lighter, summer oriented one but I don't know what kind of temperatures to expect in the mid-atlantic at those altitudes. I'm on a budget and I'm eyeing the Marmot Nanowave 45 for $80. It's tiny and it's light, at least by my standards. What do you think?
Thanks!

Mith