"He who marches out of step hears another drum." ~ Ken Kesey
The problems with these is if you mix in the container on the side you just get a nice streaking mixture of all the colors mixed in. Not really helpful for a quick glance to find a color.
I have gotten mine from webstuarant.com https://www.webstaurantstore.com/choicehd-32-oz-microwavable-translucent-plastic-deli-container-case/128HD32BULK.htmlthey're super cheap but I am actually going to switch over to the heavier duty ones you seem to have been using.The problems with these is if you mix in the container on the side you just get a nice streaking mixture of all the colors mixed in. Not really helpful for a quick glance to find a color.But more importantly, these can crack easily and if your mixing bit catches the side and grabs the container you end up with a nice Jackson Pollock painting on your wall.
There are two different weights on the Delitainers, I think the ones linked are the lighter version, and more proneto breaking. We found out the hard way, with a couple abstract paintings of our own.
Uline clear plastic round wide mouth jars.https://www.uline.com/BL_8153/Clear-Plastic-Round-Wide-Mouth-Jars
I bought a case of the Uline clear plastics, thinking how great it would be to see the colors, learned the hard way that after a few weeks the inks start to harden on the sides. The white versions of the same containers work great and don't congeal the ink. I just make a smear on the side of the jar and cover with tape, then I still have the visible color.