This has been a game changer. Storing my Copic markers in this instead of storing them in a box or all together in a tin has meant I easily can get what I need out and put it back so I can find the right again easily. The Interlocking feature has is easy to use and as this is the third one I have bought it was easy to click it into place. And they are fairly robust as long as you don't do something silly with them so they will last a long time.
As our craft purchases are reasonably expensive it is worth storing them properly. But just do what you can afford. And these are a good price point.