XL

Filled it with ice water at 7am and there was still ice clinking around at 4pm. The insulation genuinely holds up, which I wasn't expecting from a tumbler this size.

Took this on a hike last weekend and the ice from my water was still rattling around six hours later. The insulation genuinely works, and it fits my car's cup holder without wobbling.

My coffee’s still piping hot after a two-hour commute, which is a first for me with any tumbler. The lid seals tight enough that I can toss it in my bag without a second thought, and it fits perfectly in my car’s cupholder.