In 1942 the Massachusetts State College found in one study that the cost of using washable glasses, re-used after being sanitized, was 1.6 times the cost of using single-service paper cups.
1942年，美國麻省洲立大學在一項研究中發現，使用可清洗的玻璃杯在消毒後重新使用的成本是使用一次性紙杯成本的1.6倍。