The Water Bladder can replenish a small amount of water for many times in time. As we all know, you can't drink at one time during exercise, because drinking a lot of water instantly can easily cause a huge burden on the heart. Scientific research has found that the best way for people to replenish water during exercise is to drink an appropriate amount of water every 15-20 minutes. If the traditional water bottle is used to fill water, it is difficult to this frequency. Because you have to stop, take out the water bottle, open the lid, take a drink, screw on the lid, and take it back. This series of actions is repeated every 15-20 minutes. I think most people can't stick to it. And the water bag just makes drinking water easier at this point. Every 15 minutes, take a sip from the hose. Convenient, and control the amount of drinking water.So, if you are an outdoor sports enthusiast, you must choose to bring a water bladder.