Review on YETI Rambler MagSlider Lid Replacement by Wendy Benson

I travel a lot and instead of relying on airplane coffee (small cups and bad coffee), I usually buy a cup at the airport and take it with me. However, with air travel like today, there is nowhere to put a mug without risking it spilling or risking the entire mug. Even holding a regular cup can be problematic in turbulence. This cover solved the problem. Now buy my coffee as usual, pour it into my Yeti and then press the lid. Now if the cup tips over, is pushed through turbulent air, or is completely tipped over, I lose a very small amount of coffee, not all of it. Mug (as others have said, spill proof, not spill proof. Oh, and to the review that mentioned losing the magnetic slider, I've never seen that, even when the mug was knocked off my airplane tray or desk at work.