The large opening is convenient for cleaning and refilling: the 8.2 cm screw cap can be easily unscrewed, and the large water filling port is convenient for you to pour water, and you can also put in ice cubes. The inside is very smooth. Just rinse with water when cleaning. Leak-proof design: The water bag has a high-quality sealing design. There is a seal inside the bite valve, which never leaks. There is a dust cover on the outside to prevent dust from entering the hydration system. Your health is very important. Large capacity and portability: The water bag has a large capacity of 2 liters, which is enough to support your long-term outdoor sports such as hiking, cycling, mountaineering, camping, and skiing. The portable design allows you to hold it in your hand or hang it on the wall when it is not suitable for storage in a backpack. Convenient to drink water: If you need to drink water during the activity, you don't even need to stop, just bite the nozzle to suck water. The 100 cm long straw frees your hands. High quality: The size is: 14.2 inches x 6.9 inches water bag. The water bag is made of high-quality antibacterial material and is very soft. Even if you accidentally drop the hydration system, it will not be damaged, and the water bag will not have any peculiar smell. It is an ideal choice for outdoor sports.