The Jian Carrying Bag by Hanwei is very strongly made in a heavy Cordura fabric with leather reinforcing. It will accommodate any single-hand Jian or similar length straight sword.
 
Made by Hanwei.
 
Key Features:
Will Hold Any One-handed Jian
7 1/2 x 5 Accessory Pocket
Heavy Cordura Fabric
 
Overall: 44-1/4 inch

Specs will vary slightly
from piece to piece.