Stig,

Great idea I use a 90 litre canoeing dry-bag which is totally waterproof (and will even withstand brief immersion) so you don't need any liners.

I got it from Overboard , but there are others available.

http://www.over-board.co.uk/duffels/waterproof-duffel-bags.html

It takes more than enough on our +8's luggage rack , to supplement the Hills Alive cases inside the car.

Andy

Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.