According to a report by the BBC Environmental officials spent around a week using boats in an effort to float the whale and put up a sunshade for it, but the creature died last Friday in a canal in Songkhla province.
Speaking to Agence France-Presse, marine biologist Thon Thamrongnawasawat explained that the bags would have made it impossible for the whale to eat nutritional food.
"If you have 80 plastic bags in your stomach, you die," he said.
Prior to dying, the whale was reported to have vomited five bags during a vain attempt by conservation officials to save it in a canal in Songkhla province.
The bags, weighing about 8kg (17lbs), made it impossible for the whale to eat.
Thailand is a major user of plastic bags and its government last month announced it was considering a levy on them.
The BBC said that plastic bags are believed to kill hundreds of marine animals in Thailand every year.
A World is One News (WION) news article below explains more.
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