The gir­dle book has the advan­tage that it can be read with­out being detached from the belt, as it hangs upside down in its nor­mal state; when swung up to be read, how­ev­er, the text faces in the cor­rect direc­tion. After read­ing, it could just be dropped and was again at hand the next time it was need­ed mak­ing it espe­cial­ly con­ve­nient for monks, priests, and cler­ics who trav­eled through the coun­try­side for church ser­vices in monas­ter­ies and con­vents. via Not­ed With­out Com­ment.