Notabag was created as a solution to a specific, real-world problem; bags are not practical on a bike. This led to the idea and to the design that eventually became the original bag-backpack hybrid.
It transforms with a single pull on the straps, so taking it to the back leaves your hands free.
Inside the bag, there is an extra pocket, where smaller and more important things such as keys or a wallet can fit perfectly. When the bag is not in use, it can be folded into this pocket, so it fits in a small space.