Stick the open part of the box with a tape/glue.
Cover the box with wrapping paper and decorate it with stickers.
With a pen trace out the shape of the bowl/ drinking glass that you will be using.
Next carefully cut out the shapes using a pen knife.
Insert the bowl, glass etc in the cavities that you have created in the box.
Fill it with popcorn, crisps, drinks and other goodies and secure it in the box.
Enjoy the movie with the goodies in the snack box.