Originally Posted by EarlT
Somebody may have already suggested this, but the best way i have found to keep things dry in my not-very-waterproof panniers is to put them inside a plastic bag before loading them in the panniers. So far, nothing has gotten even a little bit damp using this method.
This works well for me. The suggestion I was given was to get a couple of the body bags vets use. These are very durable as well as being waterproof.