Water-resistant messenger pack designed to work with Origin8 front flat racks Removable bottom panel provides structure and offers a sturdy platform for stacking items Features a dedicated U-lock pouch, and multiple pockets for pens and small items Roll top closure with adjustable strap and buckle Durable 600D Polyester construction with TPU inner liner for water-resistance Bag volume: 3800 CI Velcro Straps 18.2`x11.2`x19` 3800 c.i. Black XXX-Large (700+ c.i.)