Here's an article* that states that all Zatarain's products are packaged in the same size pouch (5x6.5 inches with a 2 inch gusseted bottom), which is a paper/aluminum foil/vinyl laminate: http://www.southernpackaging.com/packdig2_news.pdf

I just pulled a (6.3 oz.) box of their New Orleans style rice pilaf out of my cabinet and found the pouch to be approx 75% full of product. It does appear to be lightly vacuum-packed, but not as tightly vacuumed as some bricks of coffee I've seen.

*...which, apparently, was not referring to these (Ready To Serve Complete): http://shop.zatarains.com/default.php?categories_id=1403