A holster for holding clips of fasteners for fastening application by power tools used in the construction trades. The holster includes a substantially rigid, hollow, upright pouch for vertical storage of the fasteners, said pouch having a substantially rectangular horizontal cross-section, a back wall extending upwards and having means for attaching the holster to a worker, and an angled bottom side having a hole at its lowest point, through which moisture and debris may exit the pouch.