Instead of the compression stuff sack, check out the Pneumo bags from Pacific Outdoor. They're a little on the pricey side, but in this type application I think they're worth the money

http://www.rei.com/OM/style/751095?cm_mmc=cse_froogle-_-datafeed-_-product-_-na&mr:trackingCode=EF3CE437-C2A5-DC11-BE2A-001422107090&mr:referralID=NA

They're a combination drysack/compression stuff sack, instead of using straps to minimize the size, it uses an air valve to remove all the air. They're durable, waterproof, quick to open, with no straps to catch on anything. They're much better than normal stuff sacks, without too much of a weight penalty