I cut a IL milk carton to 11 cm high (the width is always 7 cm). Again, the paper was too thick to wrap the carton so I cut panels to fit each side. For the outside sides, 6.75 cm by 10.75 cm, making sure I cut all the paper with the stripes going in the same direction.
For the inside, because those sides are another smidge smaller than the outside, I cut 4 pieces of paper at 6.5 cm by 10.5 cm and a 6.5 cm X 6.5 cm square for the bottom. If you don’t have scrapbook paper, wrapping paper will do, coloured printer paper, or even saved up manilla brown bill envelopes. Cover the box and draw some flowers on it.