This is a patented product. The cup head is equipped with a twist-lock switch, which completely prevents water leakage and achieves 100% leak-proof performance. Featuring a large water flow rate and extremely simple operation, it allows pets to drink happily and freely. As the largest capacity configuration on the market, the product can be folded for storage when not holding water, resulting in a small volume and light weight. Additionally, a special water cup storage bag is included, which facilitates carrying when the water bladder is filled and also plays a role in protecting the water bladder. Designed specifically as a drinking water solution for large dogs during travel, this product can meet the outdoor drinking needs of any large dog or multiple dogs, making it an essential outdoor pet supply.