PREFACE: This is not a proper review -- I haven't tested this travel pillow on a flight at the time of writing this nor have I used other modern travel pillows to compare against. This is an overview of the product's build quality, feel, and other features that I found hasn't been documented online yet.
The Matador Blackout Travel Pillow packed in its carrying case measures around 5.5 x 4 x 2in (sorry, no cm measurements). This differs from Matador's website listing at 5.5 x 3 x 2in. The height could probably be compressed to 1.5 inches or more, if you squeeze all the air out and/or put a rubber band around it. See pictures for measuring tape references and size comparison to an iPhone 13 Pro.
After unraveling the pillow out of its carrying case, I noticed some minor manufacturing defects. 1) A snagged/loose threading, and 2) a white dot -- both found on the soft inner lining fabric. I tried to dry wipe the white mark away, but you can still see it faintly. Thankfully, this pillow case is washable, so I'm sure a quick wash could remove it. Strange and somewhat unsatisfied that the product came as is with these faults.
I believe the outer shell material is nylon, and the inner soft material is the bamboo blend fabric mentioned on the product's listing. The nylon is a little crinkly but not loud, and the bamboo blend is soft and slightly stretchy. The nylon is noticeably louder when the pillow is fully inflated.
The drawstring toggle/cord lock can freely spin around. So even though the drawstrings twist on itself, you can easily twist it back with a little bit of effort. I found the spring lock strong, so no worries about accidentally adjusting the fit. However, you will need either two hands to unlock it or really strong grip strength to one-hand it. The lock snaps back in place fine.
The "quick-inflate valve" is also a quick-deflate valve. When the travel pillow was fully inflated, I barely pressed on the valve button and it immediately released air (it's a bit sensitive). Also, if you press down too much, you may accidentally push the valve stopper through the hole. I was able to push it back through with no problem.
I bought this instead of the STS Aeros Premium Traveler Pillow or other competition simply because there wasn't enough data about Matador's take on the inflatable travel pillow. Overall, its flexibility in baffle height and firmness gives you full freedom to adjust its comfort to your head/neck posture needs. It's a comfortable pillow, and I do recommend it. Hope this helps!