Review on YETI Rambler 30 oz Tumbler, Stainless Steel, Vacuum Insulated - MagSlider Lid, Sandstone Pink by Mary Bailey

Bought for a travel mug and also some accessories. After washing, poured hot coffee and began to shake to mix the cream. The "mag lock" hole was fully closed and the lid was tight, but when I tipped the cup on its side, the coffee spilled out of the "mag lock" hole. I wonder what I did wrong because it's a yeti. I checked everything, then turned the cup upside down: it was still dripping from the hole. No obstruction, mud or dirt blocking the shutter. Does not leak from under the lid. Just opening the drink. My $11 Contico does a great job of making hot drinks without leaking. This mug costs triple and cannot be used as a travel mug. My advice: try another cheaper brand. If it turns out to be as gross as this one, at least you will lose less money.