MUJI Water-Repellent Nylon Business Rucksack to Reduce Shoulder Strain Used for about six months. Please check the condition in the photos. Will be folded for shipping. Please refrain from purchasing if you are overly concerned about details. --- [Patented Technology] MUJI's original shoulder straps reduce shoulder strain. The design distributes the weight of heavy loads across the entire width of the shoulder straps. This reduces the feeling of excessive weight and prevents the straps from digging into the shoulders, thereby alleviating pain and providing the "shoulder strain reduction" effect. Patent No. 6445744: Patent for backpack shoulder straps and a backpack equipped with them. This bag has an internal PC storage pocket. The fabric uses recycled nylon and is water-repellent.