You haven't presented any evidence to support your claims. Your link related to BPA which, as the article explains, is in polycarbonate and the liners of food containers. It isn't in the polypropylene and polyethylene bags used by the food vendors. Do some research into these plastics and you'll see they are indeed heat resistant and safe for hot and fatty food. If you're worried about BPA, you're more likely to find it in the lining of a soup can than the soup you buy in bags from the streets.