Briggs & Riley Accelerate Backpack, Black, One Size 400D lightweight nylon twill fabric resists moisture, wear, dirt and abrasion Durable, soft-touch neoprene handle provides a comfortable grip Adjustable padded backpack straps. Product dimensions: 18.5 x 14 x 7.5 inches Aerated mesh back padding allows air to circulate against body, keeping back cool Thickly padded back panel provides comfort and lumbar support