I purchased this and planned to use it at work so I wrote my name and number on the bottom, then my daughter showed up with the real Owala so I never used it! I don't know how to get the sharpie off the bottom of the cup. I hope you do. Owala lids fit perfect!! I have some listed also. 🤩 👀 I try to describe my items as accurately as possible, but Please 👀BE A RESPONSIBLE BUYER & EXAMINE ALL PHOTOS!!👀All measurements are done laying flat with no stretching and are not exact!! 🎈Every order will include a FREE gift🎁! If you are not happy 😒 please message 💬 me. 👀 Bundle 👀 Bundle any 2 or more items 🎁🎁 and get 🎊50% 🎉off the total!!🤩 Just bundle & make me an offer! 💗 Leave me 5 stars and remind me on your next order and I will add an EXTRA special gift in your package!