The BlaqPak is our flagship bag, set apart by it's externally accessible laptop pocket, sealed up by a zipper down the side of the bag. It's front zipper pocket is expanded and substantially deeper than the PDX's . Both sizes are within airplane carry-on limits and fit neatly into any overhead bin. We didn't miss anything on this backpack, it's the house favorite and we know you'll love it too. Ships within 2 days.