This girl is sitting on - or in - Chairless. Chairless is most certainly not just a nylon strap. No, it's a "seating device for the modern nomad". Yeah, it's a chair that fits in your pocket.
Supposedly this seating device was inspired by a strap used by Ayoreo Indians. It allows a person to sit without needing to lug around an actual chair. All you need to do is slip the strap around your knees and upper body and sit. Awkwardly. [Fast Company]