Thank you for your replies.
My point was to make it transparent, so that you can easly and quickly identify the reeds. And beside that, I enjoy playing with acrylic.
Why do you think the Vandoren holders don't make a good job keeping them flat?
The Vandoren holders don't hold the reed against a flat surface, they are just a packaging item to protect the reed from damage. The reeds will warp more easily if kept in the packaging holders.
A purpose built reed case will push the reed against a flat surface so that it dries flat between uses.
The D'Addario reed case has numbers on each slot, so you can keep track of the reeds.
If you want to keep playing with acrylic, thats fine, but lay the reeds flat against an acrylic plate (or a piece of glass) and hold them in place with a rubber band or an O-ring or a piece of elastic fabric or something. The put the flat piece inside your box to protect the reeds.
My favorite reed case is called the Reed Wallet, but it is no longer made. It holds 8 reeds, 4 per side, on a flat plastic surface with an elastic band; the plastic plate is attached to a folding "leatherette" case that snaps closed. The D'Addario case is a close second but only holds 4 reeds, and you cant see the vamp of the reed.
FWIW I have had bad luck with the cases that completely seal off from air circulation, some of them have a humidity control system. They turn my reeds moldy.
Hope this helps.
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