I use plastic bins also. They sit on shelves stacked three high on a shelf five wide on each shelf. Five shelves on the rack with the top shelf having stacks of five high. the shelves run along one wall. Each end is labeled what is in the box and boxes are grouped according to species, burl or spalted etc... Well I do have ten large Rubbermaid containers filled with other wood for the lathe that had not been cut into blanks for bowl or pens but those do not count, yet.
Now the bad part, last count my wife stopped at 300+ boxes. Figure 20 blanks in a box, closer to twice that really, and you see that the blank addiction is out of hand. I admit to 6,000 blanks but fear the number is twice that. About a third are plain blanks that I bought when I first started out. These only get used for inlay work these days. But several thousand are fancy blanks with all the figure, spalting or burl that we all like to see on a pen.
The only thing that has saved me from my wife's "doom" is that I use to sell large orders of pens and all the blanks have been paid for out of profits. No family money is tied up in these blanks. She did not even mention my eight lathes, 3 metal and five wood lathes. She must have been in a good mood that day.