mikan box
A box used to pack mikan (mandarin oranges). They can be distinguished by "みかん" or an orange being printed on the box. The mikan box is a recurring trope in anime and manga, with a disproportionate fraction of all cardboard boxes being mikan boxes. In particular, a kitten or puppy abandoned by the side of the road is almost always in a mikan box.
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This tag implicates box (learn more).
