Waist bag from SEIWA. Super Pochette (waterproof type) black SSP-0. I purchased this for business use, but it has been stored without being used. It is an unused item and in good condition, but please note that it has been opened. It's convenient because you can attach it directly to the belt on your pants with a two-touch system, without using an additional waist belt. It can be used as a waist pouch, waist bag, waist pocket, or sacoche. It sells for 3,515 yen on Amazon.