"People love lounging in hammocks, and people love soaking in hot tubs, and finally the two have become one," said Andrew Liszewski at Gizmodo. The Hydro Hammock ($1,495) is a sling built for two that holds 50 gallons of hot, bubbling water. A full setup includes a pump, a portable water heater, and all the hardware required to turn the hammock into a hot tub, though you'll need to find a pair of "extremely large and strong trees" to string it up between.