Up Stairs / Up Stairs

Background-A lot of people use Trolley Bag.
But actually there is many uncomfortabitlity. when we use Trolley Bag. But it is the fact that their is no improvement
1. Sometimes it's fall down when trolleybag has over weight. So this we change the wheel to round shape
2. We made a Rail at the back of trolley bag to improve incovenient to climb stairs with holding trolley bag
3. We just place just one knob to this one knob can be substituted another
unnecessary knobs