The Half-Mass holds our busy lives together. Built for bike commuters and sized for a day's worth of gear, it has padding on the backside and along the contoured base to protect the contents and provide structure. Inside, a padded computer sleeve cradles a 15-inch or smaller laptop safely off the ground. The main compartment features a drop pocket that secures with a hook-and-loop tab, a mesh pocket, a padded electronics pocket, pen sleeves and a secure zippered pocket. The cover flap overlaps the sides of the bag to block rain; its pocket closes with a water-resistant zipper. The external side pocket stows a cell phone, power cords or water bottle. The bag's no-slip shoulder strap is fully adjustable, and the waist strap stows away. With a topside carrying handle, a reflective panel for visibility at night and a bike-light mount. Made of 600-denier 100% recycled polyester with a polyurethane coating and a Deluge DWR (durable water repellent) finish.