The Hikelite is a popular choice for day hikesit is pleasantly lightweight, and the ventilated mesh back panel keeps you comfortable in warm and hot weather. The manufacturer recommends this pack for carrying cargo between 2 and 9 kg. - AirSpeed back panel enables air to move between your back and the pack - Light weight peripheral frame keeps the pack in check regardless of how full it is - Integrated, detachable rain cover - Internal pocket for hydration bag (hydration bag not included) - Stretchy side pockets - Safety whistle in the chest strap buckle - Compression straps - Trekking pole attachment - Material: 100 D nylon mini diamond shadow - Bottom panel: 420 D nylon - Liner: 70 D nylon - All fabrics are bluesign certified This is a PFAS-free product.