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Sipitang Express is one of the popular bus operators in Sabah, and the only one to offer the international Kota Kinabalu – Bandar Seri Begawan (Brunei) bus service under their subsidiary Jesselton Express. This journey is probably one of the most unique bus journeys in the world, departing once daily, which gives you a whopping 8 immigration stamps in your passport when on the full route from KK to BSB, crossing western Sabah, eastern Sarawak (Lawas), into Temburong on the mountainous eastern part of Brunei, back into Sarawak (Limbang), and finally Brunei-Muara on the main western part of Brunei.
I purchased my ticket off Easybook about one month before this journey, not wanting to risk not having a seat since there is only one such bus daily. Tickets are sold under Sipitang Express for the Jesselton Express Kota Kinabalu – Bandar Seri Begawan bus service.