The kayaku-ire, or gunpowder flask, represents a refined intersection of practical utility and artistic expression in feudal Japan. This antique example features an integral netsuke—a carved toggle or ornamental element—that allowed samurai to secure the flask to their belt or clothing while maintaining easy access during combat or hunting. Crafted with meticulous attention to both form and function, the vessel was designed to safely contain and dispense gunpowder for early firearms. The netsuke carving often reflected the owner's status and aesthetic sensibility, transforming a functional object into a personal statement. This original piece exemplifies the Japanese mastery of combining beauty with purpose, making it an exceptional artifact for collectors of samurai material culture and historical weaponry.