There really isn't a single box that is perfect for dry flys IMHO.
The ripple foam boxes hold flys well for on the water. I tend to pack them too heavily and at times end up fishing "cripples" due to my methods.
I use the the bins for storage at home because they don't damage flies. But I worry about losing flys when I open the box in a breeze.
It will be interesting to see others responses.