Promising review: "Oh my goodness, I can't say enough good things about these tumblers! We initially bought a few to have around the house. We thought they would encourage us to drink more water. Since then, we've been giving them to friends as gifts, and everyone is raving about them. I've even brought one to work, and my coworkers keep stopping by to pick it up and admire it!
The silicone, wood, and glass parts are all very well-made — thick, sturdy, and beautiful. Every piece comes apart for easy hand-washing. I think you can put these in the dishwasher, too, but we just wash by hand. The silicone jacket keeps the glass from sweating, and it makes it easy to grip and carry. The silicone seal under the wood lid is removable and seals nicely to the glass to protect from 1) major spills, and 2) things dropping into the tumbler when outside. The straw is sturdy, too, and is easily washable with a straw brush." —Stevi88
Get it from Amazon for $9.14+ (available in four colors).