I absolutely love this pack! It eats up everything I put into it. I can carry all of my college textbooks, my laptop, a waterbottle, a jacket, and pens comfortably. The water bottle holder zips closed when you don't need it. Two pockets on the top are great for shades, cell phone, ear buds, or any little valuable you don't want crushed. The pack is made of this super tough, water proof material. I don't know if the pack is water proof, but the zippers are the same as on my water proof jacket. The laptop sleeve is positioned a bit above the floor of the pack so if you drop the pack the laptop won't take the abuse. I don't know what else to say. It is a great pack.