The main image displays the colour you're about to add to the shopping cart. Detail images display different colour packs. The Hikelite is a streamlined package - if needed, it easily slips into everyday use, without looking like you're on your way to do some ice climbing. In hiking use, you'll find the ventilated mesh back panel pure luxury: instead of backpack fabric, your back will be in contact with a mesh that allows airflow. Osprey nowadays offers a cargo weight recommendation for their packs. For this pack it's 2 - 11 kg. - AirSpeed back panel enables air to move between your back and the pack - As opposed to the size chart, this pack's size S/M suits back lengths between 38 - 48 cm, while M/L suits 45 - 56 cm - Light weight peripheral frame keeps the pack in check regardless of how full it is - Integrated, detachable rain cover - Small item pocket with key clip - Internal pocket for hydration bag (hydration bag not included) - Stretchy side pockets - Stretchy front panel poc