I have a tray that attaches to my RBI Hawk that has4 round blade holders in it...thats where I put my used blades that may still have a little life just in case I run out of a certain size. I store my good blades in drawers in my cabinet on my workbench.....sizes are labeled on the outside of each drawer. Just take the drawer with the size I'm going to use to my saw and when I'm done I put the drawer back. The rest of the drawers hold picture hangers, my dremel router bits, glue sticks, dowels, and numerous other things. I have never found the need to buy anything else when the drawers are the perfect size for my blades. Why would you want a round tube? They are too hard to get your blades out! Just my opinion! Thanks for listening!