The giant-sized national flag was hoisted up on Saturday morning at the Yayasan Sultan Haji Hassanal Bolkiah Complex’s open area to mark the start of the 77th birthday celebrations of His Majesty Sultan Haji Hassanal Bolkiah Mu’izzaddin Waddaulah ibni Al-Marhum Sultan Haji Omar ‘Ali Saifuddien Sa’adul Khairi Waddien, Sultan and Yang Di-Pertuan of Brunei Darussalam.