We made the switch to stainless steel bottles earlier this week and we will never look back. They are reusable, durable, leak proof and easy to clean and without a doubt one of the best zero waste investments I have made.This product comes with a Cheeki Lifetime Warranty.These bottles are totally leak proof.Silicone seals means no plastic ever needs to touch your water again. Lids have quick twist and soft silicone close.Cup holder friendly.Handwash bottle. Dishwasher friendly lid. Freezing not recommended.