I tend to be old style and really like the look of leather fly wallets that use sheepskin or wool to hold flies. All of my current fly boxes are made of plastic or metal that come from conventional makers to hold my flies, which work fine. My worry is that the folding leather fly wallets that use wool would appear to me to not be real secure in holding flies in place that would lead to lost flies falling out of the wallet. Most of these leather fly wallets do not have zippers but utilize simple fold over flaps. What has been any of your experiences with leather fly wallets, are they pretty secure for keeping flies, and not having them (the flies) fall out? Thanks in advance.