I have recently designed a food product bag design to be printed on a 3 seal laminated foil bag. I produced graphics for the design in Illustrator, retouched product photography in Photoshop and laid everything out in InDesign. The print shop apparently does not use InDesign. Is that industry norm??? I am need to sending something like this to a press, but am finding it hard to believe that the only way to send the file would be as an .ai. Am I crazy?