Actually my quad gets very muddy as well and I just hose it off.If you don't get carried away with the pressure the cordura sheds water pretty good.Some of the larger bags do have dividers but Iuse a smaller one that doesn't.It does however hold it's shape quite well because of the mouldings along the edges.The better bags have the mouldings but the cheaper ones don't.I use my bag to haul my axe,rope,tow strap,tire repair kit,pump and that sort of stuff so it isn't overly large.