Watertight bag for things you need to have at hand can be attached to a deck by elastic cords with plastic hooks in the ends.
The panels are shaped so the bag keeps its shape and accessing the content of the bag with one hand is easy.
The entrance is tilted up so water rolling over the deck does not get inside even when the bag is open.
Net on the top can be adjusted with elastic cords and can hold a map or other things.
Very durable polyester fabric has excellent tensile properties, is resistant to diesel fuel and detergent. It is abrasion resistant and strong in tension.