Kubi bukuro

Kubi bukuro a certain type of attire used by the samurai class primarily during the Sengoku period of Japan. The Kubi bukuro had literally referred to a head bag. This type of bag was made out of net to carry a certain severed enemy head. When in the process of walking, you must hang it from your waist. When mounted, you must fasten it from the saddle. Samurai commanders had especially made sure to carry many of these Kubi bukuro due to their rather excelled skills.

References

"The Samurai Sourcebook"