If the natural background is not fully optimal, you can use a photo background. This photo background from Lastolite has a weight of 4.5 kg.
From Amazon
Manfrotto LL LB7623 4 m Panoramic Background Cover - White
DigiBroadcast
Manfrotto MAN-LL-LB7623 Panoramic Background 4m White
Firstcall Photographic
Lastolite Panoramic Background, 4m, White - 7623