Nisus giveaways!
Bait Puck II from Strike master, I use one for open water. They're insulated, lid screws on and can hold a couple dozen. I replace the the dirt with worm bedding. They last a long time this way, just rotate bedding out every couple of weeks.
I keep worms in the summer in a small cooler filled with moss. Dirt makes too much of a mess in the boat. Every once in awhile I'll take the moss out and wash it in a bucket of water and squeeze the excess water out and put it back in the cooler. Then I replace the worms. In the winter, I use old pill bottles for my waxies and spikes. I use to use a puck but found the pill bottles fit better in my pocket. And, the wife lets me keep em in the fridge! That folks is a biggie.
Frabill dual compartment crawler can. It's larger than the other options but well insulated. I really like it in the summer because I can fill one side with water and put it in the freezer. That frozen block of ice will keep things cool for days. In the winter you can carry twice as much bait. Or worms on one side and waxies on the other. However works for you.
I can see where what your talking about would work great in the summer, with freezing one side with ice. I just pulled it up but could only see the outside of the bucket. I would like to see what the inside looks like. Any way you can post a pick?