This is my 2nd Porter 30. I bought the black one since I was going to Europe & didn't want a more colorful one to scream "tourist." I wanted a backpack to use for my carry-on. I love the features of this bag. The opted to leave the detachable hip belt at home to lessen the load since I wasn't going to hike with this bag. This bag opens wide and can hold a lot of stuff. The compression straps really help squish down the bag. It was the perfect size to put under the seat of a Swiss Air Boeing 777-300ER plane. I had aisle seats on my flights. As you can see by the photos, they fit under the seat in front of me. No more worrying if there will be any overheard space for it. Another quality product from Osprey!