It seems that we have had numerous questions regarding the Tactical Pro backpack vs the regular Tactical Backpack regarding size, capacity, etc. While I did not take measurements, I did take photos this morning to show everyone the differences side by side. (I do own them both) (btw, please forgive my odd choice of where to set them up, I still can't leave my bedroom much. lol) Here are the two in a front view side by side: You'll notice that the larger Tactical Pro has the Molle pouches on the front and the two patches. Here is a side view of the two back to back: The Tactical Pro has slightly larger pockets on the sides, only makes sense for a bigger bag. the Tactical Pro also has the side straps to keep the pack more tightly compressed when it's full. Again, only makes sense for the bigger bag. The front pockets: These two are virtually identical. They both have the same credit card slots, the same mesh pocket with a snap mechanism to attach keys and the felt-lined pocket in the back that fits my 10.5in tablet perfectly. However, the Tactical Backpack has the cord things on the bottom left there that the Tactical Pro does not. These two pockets are the same size on both backpacks. The main central pockets: The Tactical Pro has the top portion of this pocket felt-lined so that you can stick the headphone holder to it via velcro and on the front side they both have the same smaller pocket that fits notebooks and such. (a little easier to see on the regular backpack here) The laptop pockets: You'll notice here that on the Tactical Pro the laptop pocket is still under the flap that also covers the main pocket. On the Tactical Backpack you close that flap and the backpack slot is behind it. Other than that and their sizes the are designed identical, right down the bottom that has "cloth padded bubbles" for extra shock protection. One thing that is also different that I did not take a photo of is that the Tactical Pro backpack also has a built in rain guard that comes out from the bottom and stretches over the top of the bag to keep things a little more safe. Here is a photo from that taken from the Razer Store website. I think that pretty much sums it up. If folks are curious about the materials or construction, I'd say they feel identical in that regard. Really, what it comes down to, is what size works better for your needs. For myself, if I am taking my laptop anywhere I *must* take the Tactical Pro with me, I can't fit my laptop into the regular Tactical. However, when I am just out visiting friends (non-gaming) or transporting stuff that has nothing to do with my laptop then I usually take the regular Tactical Backpack. Hope that helps sort out a few of the questions between the two!