If the natural background is not fully optimal, you can use a photo background. This photo background from Lastolite has a weight of 2.43 kg.
From Amazon
Lastolite by Manfrotto LL LB8990 1 x 1.4m ( 3’6” x 4’6”) HiLite Background
DigiBroadcast
Lastolite Hilite Background 1.4 x 1m