amazon, called Munchie Mug Snack Cup. Now, it's not very cute. Frankly in my opinion, it is pretty ugly. But!! Parents sometimes MUST go for practicality rather than aesthetics, and this was one of those times.
This snack cup works better than some of the others I've seen, because the top twists on, instead of just popping on. Toddlers will not figure out how to get the top off for a long time - if ever. The stretchy over-lapping flap top keeps all the snacks in the cup as babyNOIR shakes the cup in her excitement.
Now, babyNOIR carries her "cereal-o" with her in this Munchie Mug everywhere we go without us having to tell her it's all gone because she sprinkled them all over, and we are all very happy.