great dry bags
I bought two of these day for a recent river trip in Alaska (the 35L and the 70L) and they worked great. The 35L pack is good if you want to bring a pack out on a day adventure of rafting or boating. For extended trips the 70L and 115L are probably the way to go.
Having the back pack straps on these bags is a really nice touch, but I would never hike an extended distance with these unless the load was pretty minimal.
Side note, these bags took a beating by airport baggage handling. They survived intact but I don't know how many repeated trips like this they would be able to handle.
Overall, great product, kept my stuff dry and easy to haul. Highly recommend.