Timbuk2 Command Messenger Bag Durable oxford nylon fabric feels smooth and has a subtle sheen. Waterproof TPU liner. Classic Messenger fit. Improved compliant external laptop compartment unzips and lies flat for going through security without removing your laptop. Reversed zipper along laptop compartment for improved water resistance and grab-and-go convenience. Grab the unzipped bag from the shoulder strap and go without losing your laptop.