https://ortliebusa.com/product/frame-pack-tt-4l-matt-black/ I have a 2020 Vado 5.0. The goal is to have 3 batteries and use 2 Ortlieb Toptune Frame Packs to carry the batteries. This bag is 19 inches long and the batteries do fit well. One on the top of the tube and one below it. The weight is...