The 12 oz Keep Cup was my first Simply Zero purchase that ultimately led to many more. It has completely changed the way I go about my daily life. Going to the coffee shop every day with a reusable cup has significantly reduced my waste. I even convinced my husband to buy one and between the two of us we've made such a dent in our plastic usage thanks to these little glass cups. Thank you, Simply Zero for educating us on easy ways to make a big impact!