ROCKBROS Motorcycle Helmet Backpack Helmet Bag Large Capacity Waterproof Lightweight Storage Bag with Reflective Stripe Model For Motorcycle Dirt Bike Motocross Bicycle Racing ATV, Black

I don't know how this long a** amazon link will turn out, but just in case, search for "Rockbros helmet bag" and look for the one with one strap. : ) https://www.amazon.com/ROCKBROS-Motorcycle-Waterproof-Lightweight-Reflective/dp/B0C5T8PRDG/ref=sr_1_1?crid=2YMYFEPL7EBRU&dib=eyJ2IjoiMSJ9.0xA__R5ziEi1DqdY2XQ9vQi82TIxT0ziP0COS06zdWe7XrAtfiXlRV6IcmYDQGaAJ9FCCKA9TQI0IkgqcYcZ5KAicU814vi5kRJpxo9oTq5HRTAqLSbJMhJDx2cGvyteqGzENFGHhRCy1ddJZuE-NMeTlhixGQfqDXaPw6LVem3zj22GfY8uWCnu33OAE2ap-gsDZlQ5cBAovwje26ZsuJJbNkatVJqXVwUQjqZWXIgixbtpgu_yDdUY81Qld3jakj1E4mnxhlFQjUMhlR58c34u8rWReM7M5V0PdG8ISjQ._DiG6aTepDINDN8Dt23tKq532eOYI0YdzWGdMiDSMwk&dib_tag=se&keywords=rockbros%2Bhelmet%2Bbag&qid=1782224178&sprefix=rockbros%2Bhelmet%2Bbag%2Caps%2C157&sr=8-1&th=1 **I ordered the "middle" size, easily fits my Shoei RF-SR which is a medium.