My conclusion as well. Same opening size (4.5") as the Captain's Choice and Fine bowls, but slightly deeper (2.5") to keep lather from overflowing, yet no clinking on the walls with your brush.The Chubby 2 and the D R Harris bowl were made for each other.
If you like buying DRH refills, this is much better option as soap container than the wooden bowls. It won't warp and get messy with spilling protolather. The best price I could find was from Connaught, that's where I got mine.