With this softbox from Aputure you don't have to worry about bad lighting when you're taking pictures. It is easy to carry around, since it weighs just 3.4 kg.
From Voosestore
Aputure Lantern 90 Softbox
WEX Photo Video
Aputure Lantern 90 Soft Light Modifier - Bowens Mount
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Aputure Lantern 90
Amazon
Aputure Lantern 90 Softbox - Soft Light Modifier for 600d, Mark II, 300d, 120d II, 120d and Other Bowens Mount Light