As I work out all the details for our HMW trip, I purchased several sizes/types of compression dry sacks. I have a Nemo Riff 30 Long sleeping bag with a listed compressed volume of 5.3L. The fill is 800 FP down. I was able to fit it, with a little effort, into an Sea to Summit E-vent, size small 10l - 3.3l and compress it well, quite amazing really. The e-vent size med 14l - 4.5l was a lot easier to get the bag into but obviously did not compress as small. I don't mind the small amount of extra work to get it into a small, but I was curious as to a 10ish day trip and repeated stuffing/compression of the bag and it possibly being slightly damp (I'm thinking about the fill) from breath/humidity/etc. Am I over thinking it? The small dry bag would definitely be nice to conserve pack volume but I don't want to do something bad out of ignorance. The compression thing is new to me, used to a bunch of cinch straps....Thx in advance