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I am writing this review to talk about the missing o-ring problem some buyers are having when purchasing this item. I bought the 64oz and 18oz bottle from RTIC's website two weeks ago. I got both bottles in four days and both of them leaked badly. I contacted RTIC customer support and they sent me two o-rings in the mail that arrived 6 days after being notified that they were being sent out. Yeah it sucks but what can you do. On to the o-rings. Customer support said that the o-rings "will go around the top of the lids", which is pretty cryptic since what is considered the "top"? Because of this I did some experimenting and figured out the best place to put the o-ring. Please see attached pictures to see where to put the o-ring for maximum effectiveness IMHO. In one image you will see the unaltered bottle top with the o-ring from RTIC next to it. In the second picture you will see two tops... one with the o-ring "at the top" (BAD!), and the other with the o-ring threaded behind the rubber basket (GOOD!). With the o-ring in the "BAD!" location water would still leak out when violently shaking the full 64 oz bottle. With the o-ring in the "GOOD!" position no water leaked out no matter how violently I shook the full 64 oz bottle. The third picture is of the top with the o-ring in the most effective location according to my extremely scientific experiment. I hope this helps someone out there and remember that your results may vary so test it first before you possibly leak stuff everywhere.