Only used this tumbler a few times and I have too many! Trying to make space. Please note on the video, the inside does have that discoloration. I have that with all my Yeti tumblers after I’ve had coffee a few times and put them in the dishwasher. This tumbler is dishwasher safe (it says so on the bottom of the tumbler itself) From the website: These Ramblers come standard with our YETI MagSlider Lid, the only drink lid that uses the power of magnets to keep your water, beer or favorite drink on lock. Our Ramblers are BPA-free and have a No Sweat Design to make sure your hands stay dry. DuraCoat is a durable coat of color that won't fade, peel or crack through extended field use and also provide additional grip to the Rambler's exterior. 18/8 stainless steel resists dents and drops Dishwasher safe because no one needs more work to do Double-wall vacuum insulation keeps drinks hot (or cold) to the last drop!