Hammock Bliss Tandem is the first hammock in the world to solve the problem of two people sleeping in a hammock together comfortably. The Tandem provides two separate single size hammocks which are attached together in the center. It can also be used solo, just wrap one of the two hammocks under the other to create a double layer hammock. The lower hammock can act as a lower shelf to hold an inflatable pad, multi cell thermal pad or an under quilt for extra insulation.