Our EEEkit unisex sling backpack is made of durable canvas material that is strong, sturdy, comfortable, soft, machine washable, and water repellent. The chest bag has a USB charging interface on the side, you can easily connect your portable power bank to smartphone and other devices. The padded straps with thick foam provide a fresh and comfortable carrying experience for your shoulders, and the adjustable straps guarantee a perfect fit for your comfort.