Extend the template as follows: Trace both side elements again without glue flaps, side X1 on X2. Preparation: For each carton, cover a 25 x 38 cm piece of white cardboard with wrapping paper. To do so, spray a piece of white cardboard with spray glue, then apply a same-sized piece of wrapping paper and press it down flat. Trace the outside edges of the stencil onto the white backside, then trace the dottedd inside lines. Cut out the carton along the outside edges. Preparation: For each carton, cover a 25 x 38 cm piece of white cardboard with wrapping paper. To do so, spray a piece of white cardboard with spray glue, then apply a same-sized piece of wrapping paper and press it down flat.