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First, make sure the carton is empty.
|Next, fold out the flaps on the side.
|Then, flatten the top of the carton, but leave the base intact.
|Fold the base in one piece to one side of the carton as shown on the picture.
|Fold the top of the carton so you're able to push it under the base. Then press down the base so the top stays in place and you're done!