I’m happy with the OEM tank bag. Expands to 20+ litres to accomodate a good amount of shopping. Additionally has the benefit of taking the wind pressure off your chest at highway speeds.
2018 BMW G310 GS (Goose) - Akrapovic Carbon exhaust, Barkbusters, RZM Adjustable levers, Rally Raid Touring screen, Rally Raid bar risers, Hepco Becker engine guards and Orbit C-Bow side cases, SW-Motech ION Tank Bag, SW-Motech ION pegs, Shad rack mount plate and top box.
2019 Honda CB500X
2018 BMW R1200GS Tour