I see lots of people use it, is it that good?

It's pretty handy.

This type of backpack is good in certain situations. More specifically, this will be an ideal option for travel or outdoor recreation. Here it has 2 advantages: large size and waterproof. You can easily put food and water in it, clothes, and electronics. I even put tennis rackets in it. And you will not worry that your things will get wet. But for everyday life, I do not use such backpacks because of his style. To take a walk with my girlfriends or go out into the city, I prefer backpacks from dragon-vibe.com. They are more compact, and I like their design more.