37 Liter Left-side Trekker Outback aluminum side-case. Trekker Outback side-case, with aluminum structure and profiles. Equipped with the new Monokey Cam-Side fitting system in die-cast aluminum and inserts in reinforced technopolymer. In order to fit the Monokey Cam-Side (Trekker Outback) side-cases: use the tubular side-case holders PL_ _ _CAM / PLR_ _ _CAM (18 mm diameter).