Training water bag. When full, it should weigh around 20kg. This item was used for several months and then stored for a long period. It shows little sign of wear, but there is some discoloration in one spot (see photo 7). There are no leaks of water or air. A pump is not included, but water can be added using a hose or shower when the valve is open. The liquid inside will be drained before shipping. (Due to the structure, it is difficult to remove all the water, so some water may remain inside. Please understand.)