The tea glasses from Libre are awesome. I'm a big fan.
You can get a tea tumblr or a mug (essentially wider tea tumblers with a mug handle). Their products have glass interiors, and polycarbonate exteriors for primo portability and durability. But they all have air tight lids, so you can stow them in your bag! Plus, the beverages stay hot for a very long time. Annnd, the small tumbler fits into my cup holder and can contain a regular cuppa joe.
Also, they have great customer service if you ever find an issue with your product.