The end of plastic bottle?

Looking at what materials could be used to create a drink bottle that breaks down after we no longer need it, Jónsson happened upon a powdered form of agar, a substance made from algae. When the powder is added to water, it forms into a jelly-like material, which when placed into a mould, can be shaped however you like. According to the designer, it will retain that shape until the bottle is drained.