I bought a "tumbler" when on the go. Unfortunately, the Ember Tumbler lids aren't good for a tumbler. The screw on lid makes the Ember more of a thermos which is not what I'd use it for. The sliding lid leaks and can come loose if it's bumped around enough. My use of a "tumbler" is I can put it in a bag where it can roll/get bumped around and is leak proof. I also want to be able to sip from it without needing to remove the entire lid.

For multi-day traveling, it'd be nice if the coaster can take a USB-C cable from high wattage PD charger I already have instead of a proprietary one. Maybe even add Qi wireless charging as a slow overnight charging option for those who already take a charging pad on their travels.

For me, the Ember is just an at home coffee mug.