A method of forming a backpack with an integral gun scabbard has been devised whereby the user has a convenient place for the storage and carriage of a rifle, shotgun, or other long gun type of firearm, and simultaneously can store and carry a variety of other sundry cargo while moving about. In general, described herein are suturing devices, such as suture passers, as well as methods of suturing tissue. The method may also include applying a thermal spray coating to the sacrificial substrate. A control electronics subsystem coordinates other subsystems, including the projection system and a source of image data. The restraining element is preferably designed to be removed in a non-surgically invasive manner, e.