KEMIMOTO Seat Bag I'm selling this as I've used it for about two months but no longer need it. When expanded, it's large enough to fit one full-face helmet. Available for immediate purchase. Please ask any questions in the comments. The following is quoted from the Rakuten product description: KEMIMOTO Motorcycle Seat Bag with Expansion Function 22-30L Helmet Bag Water-Repellent Waterproof Durable with Fixing Belts cb250r ninja250 GSX-S125 compatible [Variable Capacity Expansion Function] 22-30L, can accommodate a helmet when expanded. Sufficient capacity for day trips. Convenient for loading purchased items. [Convenient Storage Space] Equipped with a holding cord on the top, convenient for loading clothes and gloves. Equipped with side pockets for storing small items (the outer pocket can be used as a pouch). [Good Water Resistance] Made of 1680D Oxford fabric, the surface is water-repellent to protect against sudden rain. Also excellent in water repellency and abrasion/tear resistance. The upgraded zipper design is different from others, so you no longer have to worry about your luggage getting wet. Also comes with a rain cover, so you can rest assured even in bad weather such as rain or snow. [With Reflective Tape] Reflective tape to make you stand out in the dark, safe for night riding. [Easy to Install] Easy-to-attach and detach fixing belts, can be detached from the seat and used as a backpack with the included detachable shoulder belt. The thick belt reduces fatigue from long-term use.