you can change it with button "M"

Shoulder Strap: Detachable and adjustable

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Backpack Swiss multi-functional 17 in waterproof solar power backpack with power bank you can change it withBackpack Swiss multi functional 17 in waterproof Rugged: A large capacity backpack combines business and casual style. It has many compartments and contains multiple pockets for storing computers, iPads, and other gadgets ready to go anywhere Durable: Waterproof fabric prevents rainwater from penetrating into the bag, with good elasticity and good ventilation Sleek Design: The shoulder strap and padded back are made of highly elastic and breathable