I'm new to de shaving and very interested in this pass. In fact, I'm looking at having a brush made for me right now not knowing what I'm going to get basically.
As a cigar enthusiast, I know all about humidity control.
You can go to any pet store and buy the kitty litter clear crystals. They are cheap and will pull the moisture from the brushes.
My question is this......
How will they be shipped?
Each in its own plastic baggy?
If so, you will need to put some kitty litter in with each brush.
Don't worry, they have no scent. Many people use them for keeping cigars.
Let me know if I can help.
I'd just have each person keep the box for an extra day before packing it up to ensure that the last brush used is completely dry. Some kind of tubes could be used to hold each brush. I've used medicine bottles for travel brushes though they likely won't work for every size brush.
The cat litter thing freaks me out, please don't.