The cube ams 305 backpack is the bigger brother of the 162 with a few extra features and an additional 17 litres capacity the bag has been specifically designed for cycling but is great off the bike too like the rest of cube39s backpacks the ams 305 features deuters39 airstripes back system for optimal ventilation and airflow to prevent your back from overheating the pack keeps your back cool and comfortable and the shoulder and chest straps enhance comfort the bag also has