Abstract: A bag or holder for retaining fastening devices such as nails, staples, screws and the like is detachably positionable on a hand-held tool, such as a power drill, screw driver and the like powered by a battery, AC power, air compressor, pneumatic power, etc. The bag defines a compartment with an open top for retaining a desired quantity of the fastening devices for the user's easy access. A flap secured to an upper portion of the bag main body can be retained in a closed position, covering the top opening, and an open position, allowing ready access to the interior of the compartment. The bag can be suspended from the hand-held tool by a suspension strap secured to the bag main body. A plurality of fastening members positioned on the bag main body and the strap selectively retain the strap in an open or closed position.