HIGH QUALITY: Made of nylon material, durable and waterproof, easy to clean. Breathable, light and comfortable back and strap.Special design: Chest strap the backpack from falling off during running or getting stuck. The length of the pull-up bar (not detachable) is adjustable and is convenient for pulling when the load is heavy.Package：1 backpackFeatures Multifunction: Perfect choice for use as watercraft boxes, vacation backpacks, relieve travel pressure and travel easily.Starry Sky Color.Outer Material Nylon Size: 19-inchLarge capacity: 48 x 31 x 21 cm. Good load capacity with multiple pockets of different sizes and use to optimize storage space. Convenient and practical.Perfect gift for students: Perfect gift for semester, birthday gift, holiday gift for your smart and adorable kids. Reduce the pressure of their backpack and them from folding.