"I, like most millenials, drink a lot of coffee. While mugs are great at home, they're not awesome when you're on the go (I know, this is nothing new), and my eco-friendly soul dies a little every time I order a grande Americano in a paper cup.
That's why I love my KeepCup. This lil' guy is a bit of an investment, but in my humble opinion, it's worth every cent. It's made of durable, dishwasher-safe glass that can withstand super high temperatures (I like my drinks scorching, so this is essential). It also has a permanent, thick cork sleeve, so that you won't burn your digits while you're sipping (it's a lot comfier to hold than a cardboard sleeve, too). As for leakage, I've never had any tea or coffee escape its lid, even when I toss it in my bag.
P.S. If you're into all things environmentally-friendly, this is the reusable mug for you. The company uses eco-friendly practices to make everything from the cup itself to the packaging it comes in." —Alice Prendergast
Get it from Amazon Canada for $29.78+ (available in three sizes and three colours).