Originally Posted by
wahoonc
Trash bags on the inside... time honored method of keeping items dry in a leaky pack.
Aaron

Yup.
You said you were going to use bunges to hold the pack to the rack. A good bump can make things move around and if your bunges are not tight enough, could be a problem. Some nylon straps that don't stretch like bunges may be better. Or, use the bunges with a nylon strap as a redundancy.