Thankyou for the replies!
Most of the trip is highway, with little to no place to stop
, but if we get into trouble we will have to go off course. From your responses I think BBH bamboo & PUL would be ok, but if we find that doesn't work I'll use wool on the return trip. It's nice to know wool does work in the car, as it usually means the nappy can stay on for a little longer.
Thankyou once again for all of your replies,
Belinda.