For life raft/dingy use, I like clear Otter Boxes. Clear boxes so you can see at a glance what's in it. I also use color coded tags with a itemized list of what's in the box, attached to the box. Properly packed, they are water proof, and will float if needed. When empty, the Otter Boxes can serve as emergency water containers, bail containers, mixing bowls, etc..

I used a piece of sanilite cutting board in my old abandon ship bag, for life raft use.

A Otter Box with a nice fishing kit is not a bad thing to have in an abandon ship bag. Mine had several hundred feet of various weight line, 50 or so hooks, weights, swivels, floats, packaged bait, wire leaders, a floating Mora type knife, small knife sharpener, etc.