Hi, I'm in the market for a back/chest pack combo for a bit of whole day hiking and fishing in areas that rains A LOT. I may also occasionally submerge the bottom area (6-10inches?) of the backpack while wading. Hence, waterproof qualities are very important. I had narrowed down to 3 choices : 1. Fishpond Tundra combo 2. Simms dry creek Roll-Top bag and Chest-pack combo 3. William Joseph Coastal combo The tech spec on their official web site is a little confusing. Fishpond says the Tundra is waterproof, while Simms says the dry creek is only water resistance. My local fly shop only has the Tundra pack and on first look, it seems doubtful to me that the pack will keep my stuff dry if it rains all day...? Any practical experiences with the above 3 combo? Any other combo out there that will work in my situation? Any experience and recommendations will be appreciated. Thanks in advance!