Editor’s note: 5 pieces of 2-litre PET bottles are enough for manufacturing fiber for one large T-shirt; 20 pieces of 2-litre PET bottles are enough for filling a winter jacket; 35 pieces of 2-litre PET bottles are enough for manufacturing fiber for a sleeping bag; 40 pieces of 2-litre PET bottles are needed for 1 m2 of carpet. The rapid development of PET industry brings about an attractive market of regenerated polyester, strongly promoting the implement of cycle economy of textile industry.