long sword cloth bag; bag for long swords
A cloth bag used to carry or store a 太刀 (tachi), a type of long Japanese sword. Historical term; not an everyday modern item.
See also: 太刀
An old tachi bag was on display at the museum.
Compound of 太刀 (tachi, 'long sword') and 袋 (fukuro, 'bag'), with rendaku voicing of ふくろ to ぶくろ.