A holster strap that allows for the attachment of a variety of holster types (thread-on, clip-on, paddle, as well as left and right holsters) to a backpack waist belt. The holster strap allows quick access and removal of a holster and includes a base and a strap. The base may be secured to the backpack waist belt and the strap secures the holster to the base. The strap may be stretchable and durable such that it may hold various size holsters with a heavy firearm, camera, or another item. The holster strap allows a holster to be quickly removed from a backpack waist belt and transferred to a belt when the backpack is removed.