This drawstring backpack is made of waterproof Oxford fabric, which is lightweight, sturdy and durable. It has excellent waterproof and storage capabilities, and can be easily adapted for various activities such as daily exercise, fitness, mountain climbing and running. The bag comes in two sizes: small and large. The large size can directly hold a basketball, making it more practical. It features a KK snap pocket design for convenient and quick storage of small items, and is more accessible to retrieve. The product offers over a dozen vibrant color options. The design is simple and fashionable, and customization is also available.