The cube pure 11 backpack is exceptionally lightweight and offers high breathability thanks to the deuter airstripes back system this ensures your back won39t be sweaty and overheating when you39re riding the mesh shoulder straps also offer high breathability and there is a sternum strap for additional support straps around the weight provide further support and they too are mesh for high airflow this back pack is compatible with hydration systems so you can have hands free hydrat