The Sushi Roll is more than a clever name. It does one thing, and does it well. It holds your larger/bushy flies without mashing them. They are rolled and the foam ridges you see on the edge, keep the flies in a air pocket, safe from crunching. Open ends allow all that natural material to dry out properly after fooling a few fish.
The Sushi Roll is simply the most effective and convenient way to transport your big flies safely, without damage.