I'm thinking of buying a Seawind 1000 catamaran, and they have outboard motors and the two fuel tanks hold a total of between 100 and 120 litres of fuel.

I realise that I should carry spare fuel when cruising, and I also realise that one must be very, very careful with petrol (as compared to diesel).

How do others who have outboards carry their spare fuel on their boats?

I remember seeing somewhere (maybe on this site) sometime ago a photo of a yacht that had a 15-20cm board/plank held horizontally between two lifline stanchions, and a few 20 litre containers (plastic, I think) tied to the board. This looked about the best I could think of.

Also, what are the pros and cons of plastic 20 litre containers versus the metal ones?

Answers to these questions - and any other information - would be gratefully appreciated.

Thanks