Portable mini usb air compressor (for inflatable bed)

When I am travelling with motorcycle I have no room for extra things. I was always upset from blowing this inflatable bed. Often after some beers.... I was dizzy :). Now I can take this and enjoy blowing ;)

Extra material
1 x DC motor, it's from some toy, probably is only 3V, but it can run at 5V from USB, at least for some time until the bed is ready :)
1 x Switch
7 x Screew
1 x old USB cable
1 x Capacitator 500uF
1 x Capacitator 104

Be sure, that your USB (powerbank) can handle th