Materials

For this project, you will need:
-2 similar, straight cups 
-a knife 
-glue 
-sealant
-ribbon

cut off the top portion off of one cup

insert the cut cup into the full cup. glue it in place. 

cut a flap in the bottom cup, making sure to not puncture the top cup. 

glue the ribbon around the cut to conceal it, while making sure it still opens. then continue to decorate the cup to avoid any suspicion. 

seal the top edge of the cup neatly with a water proof sealant.