India successfully put into orbit five British satellites with its Polar Satellite Launch Vehicle’s XL variant (PSLV-XL). This was the first commercial mission for Isro in 2015. It was the heaviest commercial mission for the PSLV rocket till date though its total carrying capacity for such a mission is around 1,750 kg. Of the five British satellites, three are identical DMC3 optical earth observation satellites weighing 447 kg. Of the other two satellites, CBNT-1 weighs 91 kg and also is an optical earth observation technology demonstration microsatellite, while the De-OrbitSail weighs 7 kg. This is an experimental nano satellite for demonstration of large thin membrane sail and drag deorbiting.