I bought this pack originally looking for something I could use to transport my laptop and sundry items between work and home on days I chose to bike. My route is through the forest and can be muddy. This pack is so nice looking that I didn't want to muck it up, so it quickly became my everyday pack for driving to work and business travel instead. It fits so much stuff in it that I call it my portable office. The side zip pocket fits my laptop's power pack, power adapter and mini speaker; while the mail compartment easily fits my laptop (12.2"), spiral notebooks, computer headphones and other odds and ends. The bottle holder on the side is also useful for mini my umbrella. The smaller zip pocket fits my wallet, phone, glass case and pens. When I'm visiting HQ, I just carry the backpack between meetings rather than juggling computer, phone and notebook. I've traveled heavily by car, train and plane with this bag for two years now and it still looks great inside and out. (Mine is black with turquoise lining.) I was skeptical originally of the fact that items in in the large compartment are only secured by the flap and one strap, but it closes tightly and I've never had anything fall out. The smaller zippered compartment has a handy key chain holder. And the top handle conceals another small zippered pocket for quick access to my office badge.