From Empire of the Winds: The Global Role of Asia’s Great Archipelago, by Philip Bowring (I.B. Tauris, 2018), Kindle p. 214:
The commercial merit of large Javanese junks was immediately apparent to the Portuguese. Assuming stable ratios of length to beam to depth, a 30-metre junk would have had a tonnage of about 150 tonnes, while one with 1,000 tonnes would have a length of about 55 metres. For their first commercial voyages after seizing Melaka, the Portuguese collaborated with an important Hindu businessman who had two junks of around 200 tons burthen, each with a crew of about 80. Another witness was the Portuguese adventurer and writer Duarte Barbosa, who was based in Kerala, spoke the local language, Malayalam, and sailed much of the Indian Ocean. He wrote around 1518:
There also come hither many ships from Java, which have four masts, very different from ours and of very thick wood. When these ships become old they fit them with new planks and in this manner they carry three or four plankings, one above the other; the sails are of woven osiers and the ropes of the same.
They carry much rice, meat of cow, sheep, pig and deer dried and salted, many chicken, garlic and onions. They also bring hither many weapons for sale, that is to say, lances, daggers and swords worked with inlaid metal and of very good steel.
They bring likewise a yellow dye which they call cazumba and gold which is produced in Java. They bring their wives and children on these ships and there are some mariners who never leave the ship to go onshore […] These ships also fetch pepper from Sumatra, silk and benzoin and fine gold and from other islands they fetch camphor and aloes wood and they also navigate to Tenasserim, Pegu, Bengal, Calicut, Coromendel, Malabar, Cambay and Aden with all kinds of goods.
Far Outliers 