Mountain Warehouse Ventura 40L Rucksack - All Season Travel Backpack Capacity - 40 litres, for camping, outdoors, travelling & festivals this spring & summer Compatibility - Hydration pack compatible. The bladder is not included Airflow back  Allows air to flow between your back and rucksack, keeping you cool Compression straps  Reduces weight and aids balance Rain cover - Concealed pocket at the bottom, extra protection and safe