A blind bag: Many toy companies sell "blind bags" of their toys these days. My Little Pony happens to be one of them. They are sold with generic packaging on the front, with no indication of what pony is inside the bag, thus it is a "blind bag" because you do not know what is inside it. xD
Ah, technically with the MLP FIM Blind Bags, if you know the code and where to find it located on the outside of the bag you can identify what's inside the bag without having to open it!
...Though people aren't technically supposed to know that, so shhhh. lol