The Minions are small, yellow, cylindrical, creatures who have one or two eyes. They are impulsive creatures with little self-control, but with a wide-eyed wonder and odd innocence that endears them to viewers and makes them relatable. They can be pesky when they are doing weird interactions with other people, animals, or objects. A rambunctious bunch of simple-minded homunculi, Minions are a similar size and shape, but have unique features to tell them apart, such as height, number of eyes, roundness or secondary features such as hair, eye/pupil size or clothing.
They're also the best part of the Despicable Me movies, at least in my opinion...
The cache you're looking for is Minion themed. If you haven't seen the Despicable Me movies, don't worry, no special knowledge is needed. It's a large cammo'ed peanut butter jar with a themed logbook. I think kids will find it fun, and it's big enough for most trackables, some toys and the log/pen.
Good luck!
Have fun!
Let's go Geocaching!