How about this ...

The bass in inside a box with a hinged lid ...

... In fact, it is attached to the lid ...

... When you set up, you put the box on its side with the hinges on the ground, and you open the lid outwards and down, until it rests on the ground. with the bass drum and pedal attached and ready ...

... you then sit on the box and bang away, until you've finished, at which point you simply fold the drum back into the box by closing the lid back up ...

the box can also contain any other bits and bobs you might need ...

... any use?