With so many tubes of paint, I found myself spending way too much time looking for a particular color when I was painting. I came across this 4 part plastic storage container at Target for about $10.
I divide my paint in a way that works for me: yellows & browns; blues & greens, red & everything else, and the 4th container I put my large white tube, palette knives, glass scrapper and other miscellaneous items I carry.
I keep it divided in my studio then pop it together to take it to classes or workshops. Word of caution. If you have a lot of paint, the individual layers, which snap together, can pull apart when you pick them up. ... I learned that lesson the hard way. My solution was to get a strip of Velcro and strap it around the container when I move it. It works like a charm.
This is what it looks like in the top drawer of my "art cart"
a counter height rolling cart I bought at Ikea.