BTW, the most cost-effective 'dry bag' is a plastic trash compactor bag, which you can buy at Walmart or almost anywhere. I compress my down bag into a stuff sack and then into a trash compacter bag before inserting into the sleeping bag compartment of my pack. Using a down bag in a frequently damp climate is risky, so I take more than average precautions. After all, my hydration bladder could spring a leak. I keep my extra clothes in a nylon compression dry bag. I do the same for kayak camping, even though it goes into my water-tight hatch.