The Atom Sling falls somewhere between a hip pack and a backpack. It's got a decent 8 litres of capacity but the simplicity of a single shoulder strap worn across the body which has an additional and handy stash pocket. When you need something, the design allows for you to rotate the bag for easy access, making it perfect for around town. Patagonia Atom Sling Backpack - Birch White W/Tidal Teal