I have front and rear water tight bulkheads in my guillemot. But to ensure safety I still use float bags in both compartments. I have heard too may stories of hatchs comming off in big surf or a bungie failure. This way you use the bulkheads as primary flotation and have a backup for the weak link (hatches)

Jack

> I give you some southamerican tip, that really works. Instead of floating
> bags, we use to filling the ends of the boats with lots of 1 liter empty
> plastic (PET) bottles, securely closed. Thus, you can have some kind of
> "cell" compartments that allows you:

> a) Fill the space required depending on your gear. b) Face the hazard of
> one punched floating bag.

> Hope this helps.

> Marcelo.