Despite its apparent simplicity, we've enhanced the performance of this backpack with an insulated water bottle sleeve and ua storm technology that repels rain. Details: ua storm water-resistant technology keeps things dry durable tpu-coated bottom panel extends across the front for added durability full-zip insulated pocket on the front that doubles as a water bottle sleeve or valuables pocket valuables pocket on the front adjustable laces that can be easily tied for a custom length and fit front panel with molle webbing adds more attachment points custom ua clip on the front fluoride-free water repellent treatment volume: 22 l 100% polyester dimensions when the accessory is full: 53 cm (21.25 inches) high x 39 cm (6 inches) wide x 7 cm (0.87 inches) deep