I have this in both sizes: 16 oz and 32 oz. I love these and use them repeatedly throughout the day. Both of mine have been getting a thorough work out of over 3 months and are showing no signs of wear and tear. They work as well today as when I first bought them. This is what made tea workable again for me given the convenience of use and no more tea leaves in my cup (like I get with tea balls and other methods).