I bought this backpack for school, as well as for travel. It is very spacious, can hold laptops, and in general, is very sturdy and longlasting. It is water-resistant and the available color choices are adorable. I bought a pink palm frond patterned one and I love the brightness of the color and how subtle the palm frond pattern is.
It is only slightly larger than the Large Seoul Backpacks, however, the main difference I noticed was the placement of the laptop "pouch" or pocket. With the Large Seoul, the laptop pouch is inside the main compartment--and an open pouch. With the Extra Large Seoul, the laptop pocket is by itself, located between the main compartment and the back straps--this does affect the way the bag will feel on your back if you decide to put the laptop in the "designated" pocket.
I personally feel uncomfortable when I wear a backpack and the back of the bag is stiffer. So when I do carry with me my laptop, instead of using the "designated" pocket, I just place it inside the main compartment so there is more padding.