I use the fiberglass/plastic reeds exclusively because the cane reeds burn out too fast and if I buy a box of 10 I might only get four that are any good at all.  But recently I decided I wanted to try a few different cut styles and weights of reeds to see if maybe one is better for jazz and another is better for bright pieces or whatever.  This lets me keep my reeds organized.  The slots have embossed number labels (1 - 12) so you can easily see which slot your reed is in.  So as long as you remember which reed goes in which slot, or maybe write it on an index card and keep the card inside the case, this is a nice little reed case.  It will fit Legere plastic reeds.  It will also fit any standard-size cane reed.