I'm pretty new at this, but I like stuff organized, too. I bought a pack of 100 3 X 5 inch clear bags you can write on and I keep my filled cartos in those, marked with flavor and nic level. Those all go into a clear craft box with a handle so when I want to change flavors I can just pull one box out and choose from the already filled stash. I haven't had any leaking issues yet, but the combination of the little plastic bags and the plastic container should take care of any that arise. All my empty carts and syringes, etc are also in craft boxes with separators. I bought three essential oil binders from Amazon and my juice is in there. I pull it out, open it up, and the bottles are held in with elastic straps so I can see exactly what I have and what is getting low. I have a big coffee table in my office with drawers and all of these boxes and binders fit nicely into the two big drawers. I still have two smaller drawers that I'm sure will be full soon.
Oh, and I have a long, skinny bamboo box (like you use in a silverware drawer) that I keep my charged batteries in. When one dies, I throw it on the charger and grab another from the box.