“Fill Forever” is a reusable, eco friendly, fully recyclable, and lightweight water bottle. It was created to be offered by EPAL, the public water supplier in Portugal, to promote the consumption of tap water everywhere, and not just indoors. Its design, inspired by a water cascade, is ergonomic and all its details were given careful attention to optimize resources and energy used in its production process. The 500 ml PET bottle weights 27.5 g, and uses a manufacturing process that consumes much less energy when compared to glass or aluminum, materials that are often used to produce reusable bottles. The cap was also optimized and weighs 1.25 g.