I usually use two 35 liter dry bags in my Cooke Custom Sewing Pioneer pack - I prefer this to a large drybag backpack in that the 35L dry bags are much cheaper and last longer when protected by the portage pack. Additionally it allows for more organization, and a failure doesn't mean EVERYTHING gets wet.

This does have drawbacks however - the dry bags take up some space, and they weigh quite a bit. In an effort to reduce weight for an upcoming fly-in trip, I am debating using a more traditional plastic pack liner. Curious if anyone uses a pack liner, and if so, what experiences have you had with rain and/or an unexpected water exit from the canoe? Does a pack liner keep gear dry when submerged? I would think it's not as waterproof as a true dry bag, but I have not used a pack liner since I was a kid (back then I used a contractor trash bag in my Camp Trails hiking backpack!). I suppose properly secured, a pack liner could be as dry as are the dry bags (although obviously not as robust - but not sure that's even necessary when within the portage pack.
Would love to hear thoughts and experiences with pack liners!

This does have drawbacks however - the dry bags take up some space, and they weigh quite a bit. In an effort to reduce weight for an upcoming fly-in trip, I am debating using a more traditional plastic pack liner. Curious if anyone uses a pack liner, and if so, what experiences have you had with rain and/or an unexpected water exit from the canoe? Does a pack liner keep gear dry when submerged? I would think it's not as waterproof as a true dry bag, but I have not used a pack liner since I was a kid (back then I used a contractor trash bag in my Camp Trails hiking backpack!). I suppose properly secured, a pack liner could be as dry as are the dry bags (although obviously not as robust - but not sure that's even necessary when within the portage pack.
Would love to hear thoughts and experiences with pack liners!