I've used a large fabric/thread reinforced, plastic tarp. I put the unfolded
tarp over the luggage area, put in what I want stored. Then I fold the back
of the tarp forward over the stored items and under their front edge, then
sides of the tarp over the stored items, then the front part of the tarp
folded back over the items and tucked in the rear. It has always proven to
be completely water-tight. I bungie the "package" into the storage bin. Very
compact and sturdy.

Bob Stevens
'87 Syncro Westy

P.S.: I now have a Thule Summit roof box (about 8' long) that I haven't used
yet. I'll use it on trips of 1+ weeks duration to keep the "cabin" more
clutter free and items easily accessable.

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