Quill work, in relation to bags and purses, is a form of textile embellishment traditionally practiced by Native Americans that employs the quills of porcupines as an aesthetic element. Quills from bird feathers were also occasionally used in quill work. Reference: Wikipedia
Below are some examples, information and price guides of quill work bags and purses including a Northern Cheyenne quill work and beaded pipe bag and a Sioux quilled bag.