Storing blue crabs in the boat and overnight

[michauxii]

Planning on catching blue crabs for our upcoming GI trip.
When we are on the water during the day, I plan to have a styrofoam cooler (and lid) with about an inch or so of saltwater and a small "bubbler."
Will keep a frozen Coke bottle with them through the day.
Also plan to crush the bottom part of their pincers.

At night I planned to put them in a large coated bait cage at the marina dock.

Is this the best way,or does anyone have better info/ideas?