It seems like you might be referring to plastic water cans or containers used for storing and transporting water. These containers are commonly made of plastic materials and come in various shapes and sizes. 

 Water cans come in different sizes, ranging from small bottles to larger containers with capacities of several gallons or liters. The shape and design can vary, but most are designed for easy carrying and pouring.

 Plastic water cans are commonly used for storing and transporting drinking water. They are convenient for individuals or families in areas where access to clean and safe drinking water may be limited. Additionally, they are useful for emergency preparedness, camping, and outdoor activities.