Hi. I store my alcohol inks standing up. They are in a plastic bin I bought at Michaels. I did have one that leaked out quite a bit when it was laying on its side, so I do try to keep them upright now. I guess I do wonder if storing the mixitive on their side would make it easier to mix up, but I am afraid of leakage.
I thought about the ranger box, but didn’t get one. I have other things (like embossing powders, reinkers, etc) stored in the same type of plastic box, so I wanted to keep everything stackable.