The karrimor wind 255 daysack is a superb pack that has karrimor s airspace back system to minimise contact between your back and your pack to offer an excellent level of breathability and comfort making it the perfect choice of bag if you are enjoying a long hike and for walking in a hot and humid climate the airspace back system makes the pack stand rigidly away from your back and minimises contact in order to let air flow both horizontally and vertically to keep your back cooler and more com