The Varo Messenger shoulder bag is made of durable 420D polyester and features smart seams, making it 100% waterproof. The padded laptop compartment for a 15-inch laptop keeps your laptop safe and dry at the office or school. The adjustable and removable shoulder strap prevents it from getting caught in the spokes while cycling. The R&K mounting hooks are adjustable in diameter to fit your bike's luggage carrier. You can also neatly cover the hooks with a zippered pocket. There's a waterproof zippered pocket on top of the bag's flap. Product Specifications: - Material: Waterproof 420D polyester - Capacity: 15 liters - Color: Gray - Weight: 1.31 kg - Dimensions: 39 x 30 x 13 cm - Attachment: R&K mounting hooks