Took my wine tumbler camping last weekend and the lid kept pine needles and ash out of my drink the whole time. The slider is easy to nudge open with one hand, which matters when you're holding a plate in the other.
Andrew★★★★★
The MagSlider lid clicks shut with a satisfying little snap, and I haven't had a single splash since. It fits my 10oz tumbler snugly enough that I can toss it in my bag without worrying.
Richard★★★★★
Took this on a camping trip and the MagSlider lid kept pine needles and ash out of my wine the whole weekend. The magnetic slider is easy to nudge open with one hand, and it seals tight enough that I didn't worry about spills in the tent.