The sweet ladies at baby girl's daycare (shout out to Connie and Kris!) turned me on to an awesome product by Inchbug. Inchbug makes a personalized, reusable stretchy label that fits over bottles and sippy cups called the Bumpy Name Orbit Label.
No more mix-ups at daycare or playdates, and no more writing names with the Sharpie only to gradually wear off in the dishwasher. Inchbug labels are dishwasher and microwave safe.
A package of four labels with one line of personalization is $12.95, or two lines is $13.95. You can also add icons such as a flower, heart, smile or star for .75. We love our inchbug labels!