Printed Kraft Paper Pouch with Side to Side Rectangular Window

In the past, if kraft paper pouch with a side to side rectangular window, we can't print on both front and back panel, it needs to add a film, such as: PET, MattBOPP. 

But now with the continuous development and improvement of technology, although the pouch requires a side to side rectangular window, we also can print directly on all sides of the kraft paper pouch at the same time.