"Easily added to the seat back of my Rover-8, and well sized to hold my small set of bike tools, some patch kits, a CO2 inflater and a few CO2 cartridges, as well as a regular tube and a linear tube (for the rear 20" wheel.) I also cram in some zip ties, electrical tape, and a small container of talcum powder. Not a huge volume, but much greater than the under-the-seat tool bags seen on many mountain and street 2-wheeled bikes, which are stressed to carry more than a tube."