Cotton bags are costly, and traders do charge for them, plastic bags ARE free. 10 kg floor in a plastic bag is safe from moisture and pests. Are bags of cloth too like that? Lot of grain just rots because it in gunny bags. Do you want us to go to 60s, when lanterns were the only source of light? Then, cotton too is manufactured from trees and so is paper. Haha. Can you pack your curd rice in a newspaper bag? Try it. Also try a cloth and brown paper bag. You can say use banana leaves. But India is large, with large demands. Such leaves cannot meet the demands unless vast tracts of lands are devoted to bananas ONLY. What about the packaging by manufacturers? PS: Plastic sheets can line canals. Try it with paper and cloth.