The Patagonia Atom Sling bag is a quick seller and customer favorite. It carries the fundamentals with all the comfort of a backpack, the convenience of a shoulder bag and the ergonomic, low-profile performance of a couriers tote. The Atoms teardrop shape keeps the pack right behind your shoulders where it stays out of the way when youre moving through crowded streets and subway terminals. When you need to grab something from your pack, the single-strap design lets you simply rotate the Atom to the front for quick access. The large, zippered main pocket has mesh and stretch-woven pockets inside (with hook-and-loop closure) to organize small items. A convenient zippered pocket on the shoulder strap has a soft lining to protect your valuable electronics, and adjustable buckles provide lash points for any extras on the outside. Breathable 3-D spacer mesh pads the shoulder strap and back panel to wick moisture, dry quickly and increase ventilation. For biking and hiking, an integrated waist belt keeps the pack close to your torso. Made from 450-denier 100% recycled polyester, with a 450-denier 100% recycled polyester base. The lining is 200-denier 100% polyester. All fabrics have a DWR (durable water repellent) finish.