This vintage Zilie leather shoulder clutch is the perfect addition to any traveler's collection. Measuring 12"x5" inches, it is small enough to fit inside a suitcase. I don't know the actual name of this leather bag ,some say it is used for the removable collar for the Zelli coat 

Crafted from genuine leather, this travel bag is a true vintage piece. The timeless design is perfect for those who appreciate quality craftsmanship and classic style. Made by Zulli France, and the interior is spacious enough to fit all your travel essentials. Add a touch of vintage charm to your next adventure with this Zilie leather shoulder clutch. Size: 12” x 5” .