These great travel bottle are Eco-friendly and PBA free making them re-usuable - saving on land fills. When empty the water bottle folds flat and the compact size fits into a pocket purse or backpack making it great for hiking and traveling. Once filled it stands freely and the handy Carabiner makes it easy to clip to a purse belt loop or backpack for hands free carrying and quick access. They are easy to clean just fill with warm soapy water shake well and rinse thoroughly. It holds .4.5 liters of liquid. Foldable water bottles are: Reusable Freezable Foldable Washable Attachable and Identifiable!