If you're anything like me, while working through a rather large pile of axles, they seem to always end up on the floor.
In the image you'll see my pile of axles and a piece of foam, corrugated card board and a zip lock bag.
I like to use the foam to keep all the axles together, to keep them from rolling off the work table when grabbing for them.
Here's the image of the corrugated card board that I like using for storing the different sized axles in. Plus I'm able to mark the diameter sizes on the card board.
This is how I like to store my different sized axles and keep them all together and ready for next year's season.
Hope this gives you some ideas on how you can store your Pinewood Derby axles.