For a ditch bag, one item that is really important is a cutting board.

Think about it, if your on an inflatable boat, how are you going to clean your catch?

When I use to sail, i cut a piece of wood that would fit the bottom of my ditch bag. Made it more sturdy, and doubles as a cutting board and anything else.
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"One should not increase, beyond what is necessary, the number of entities required to explain anything"
William of Ockham (1285-1349)