The Posture Vertical Backpack is the first backpack of its kind designed specifically to optimize posture. The unique and ergonomic carrying system allows the weight to be close to the center of gravity at the sternum. This naturally expands the chest, engages the core muscles and positions the head over the shoulders while the spine rests in an S-curve and the hips and knees are properly aligned. This innovative design also gives your shoulders free range of motion. As a result, the backpack feels significantly lighter. The Posture Vertical Backpack is the ideal companion for the office, the gym or a weekend adventure. It is perfect for hiking as well as biking and has a great fit for both men and women. Made of waterproof material, the backpack also features a USB charging port, a trolley holder, a laptop compartment and a hidden one for valuables, in addition to several other compartments. The top of the backpack is foldable to increase or decrease the volume.