I used one of the old blue Vandoren reed cases back in the day, off and on, the one with the desiccant capsule in the middle. I always got mouldy reeds with that thing not matter what, so I stopped using it.
This new version is a different story though! It has vent holes in it and it is much improved! I'm playing all the time so I never wet the sponge as there's always enough 'moisture' in the case coming from the reeds - as indicated by the colour changing patch. I'll be honest, I thought that was a gimmick at first, but no, it's actually very useful and accurate (for me at least). I love that it is clear too, so that you can see through it!
This is working well for me, and I'd recommend it!