The $8 Munchkin 10oz Sippy Cup. It’s technically made for toddlers but it excels over any other travel mug unless you want insulation. I don’t care about insulation because I don’t want to wait an hour until it’s a good drinking temp. Instead of some stupid spout mechanism that gets dingy and can’t be washed in the dishwasher, there’s a simple silicone lid you can drink from on all sides, and it’s all dishwasher safe and super easy to clean. It also contains a perforated screen perfect for steeping tea leaves or cardamom tea. Of course there’s the brilliantly simple spillproof aspect as well. I’ve had mine for 4 years and there’s zero wear on it.