The Engwe Bike Trunk Bag, made from water-resistant carbon composite leather, features a foldable design that expands into a pannier for extra storage. It includes shoulder straps for use as a messenger bag, with a padded interior to reduce shock. Crafted from durable 420D polyester and waterproof Oxford cloth, it's easy to clean and perfect for cycling. Note: The 35L rear rack bag is not compatible with M20 and X series (X20/X24/X26).