Is it a seat? Is it a backpack? It's both!
The seat-pack is great for day hikes and picnics, especially with kids. Everyone can bring their own seat along so they don't have to sit on sharp rocks or wet grass. They're waterproof, the straps are detachable, and the seat itself is surprisingly comfortable.
If I were to design these for mass production I would either intend them to be disposable (if you're camping you could burn it) or I would make them from a more durable material, though still recyclable, like polypropylene.
