@Padded53 Hello, Other diapers I have tried that are plain white are the Rearz inspire in control. These are all plain white and have a very large capacity, but are a bit pricey.
I normally use the abena M4's but decided to change over to BetterDry because of the changes they made to the abenas. They do swell quite a bit but work very well capacitywise. There ia another brand out there that is called Seni super, it is a cloth backed diaper from Poland that does a decent job also, but dont recommend for side sleepers as they tend to leak, hope this helps in any way.