Ok just taken a piccy for this thread. HERE is how my floss is stored. It's DMC. I have bought a DMC Floss Sample Folder which like the name suggests has a small sample of every colour of DMC floss available... including metalics etc. So if I lose track of a certain floss' DMC number I can compare the mystery floss to the samples. I also pull out all the floss I need from the storage boxes for any given project and pop them onto a key ring (which sometimes I do a stitched sample so i know what project they relate to... there's an example of two of these key rings in that photo).

I wind the floss onto white plastic floss "cards" that are the right size for the storage boxes. I used to use white cardboard ones but after over 20 years of stitching they were getting a bit dog-eared.... the plastic will last longer.

You can also buy DMC number stickers for the cards which I'm going to get soon.... the only downside of the plastic cards is that you have to use permanent marker to write the number on them (I use to use pencil on the paper ones so I could erase it if need be to change the floss colour).