I like the Snow Peak Titanium Cup I because it is very strong, light, has a handle, and can be used to boil small amounts of water. Can easily convert the Cup I to an insulated cup by sliding it into one of those very thin foam can cozies.
Unfortunately, the Cup I doesn't appear to be available anymore (at least, not that I can find). Here's a picture of the "unavailable" Cup I at Amazon:
The Cup I weighs 1.1 oz with a capacity of 9.5 or 10 ounces. Adding the can cozy brings the total weight up to 1.5 oz -- pretty good for an insulated titanium cup that can do double duty as a very small pot once the cozy is removed.
Snow Peak's current version of this cup, which is called Titanium Cup II, has a little less capacity, yet reportedly weighs a few tenths of an ounce more, than the Cup I version.
The Cup II has angled sides, unlike the straight-sided Cup I as shown by the Cup II at the link below compared to Cup I at the above Amazon link:
Don't know that the can cozy would work very well with the Cup II version due to the angled sides of that version.