I'm really happy with this backpack, it's better than I expected it to be! Inside, the backpack is very spacious. As you can see in the picture, I put many things in it and there is still room. Because the backpack is tall, you can fit books and stuff like that up to size A4 in there nicely. The panels to put pins on are removable, so you can also swap them out of you want to. Also, there is a small pocket in the back. For reference: My phone (Galaxy S8) fits in there and there is still room. I got a small pin as a present, too. Thank you for that :) I hope this backpack is going to hold up over time, I might post an additional review about that. I can definitely recommend it!