A Kickstarter project has taken the world by storm. Benjamin H. Frederick introduced us to the Hydro Hammock with his listing on the crowd funding site. The Hydro Hammock may just look like a hammock, but it also doubles up as a hot tub. It may very well be the most relaxing invention ever made. The hammock contains a portable heating system that will heat any water you put into the hammock – including sea water and river water. The hammock is completely waterproof and highly tensile; it has the capacity to hold up to 50 gallons of water and can be charged through electricity or solar electricity.