Like all of Heimplanet’s products, the Motion series packs are thoughtfully designed for maximum versatility, durability, and intuitive function. The 20-liter Arc & larger 25-liter Ellipse both feature a streamlined wedge shape, 3D molded back padding, loads of stretch, padded & fleece-lined pockets plus hidden gear loops, and removable waist & sternum straps. They are equally adept at day-hikes & urban commutes.