It's the perfect size...it won't make you look like a turtle like those oversized book bags out there.  The materials used in this backpack are very heavy-duty.  The layout is excellent, so it can hold more things in less space. I like the cellphone pocket on the strap, and the ipod pocket inside with the grommeted hole for the headphones to come out of. The straps have a shock-absorbing bungee material, so it's easy on your trapezius and the cloth material of the backpack will last longer. I use it for day hikes.