I bought this pack for upcoming international travel because I wanted something for walking around cities, and it looks like I'll enjoy using it. It's not a particularly large pack (if I were a woman I might think of it as a purse replacement), but it's big enough to carry a light jacket, sunscreen, water bottle and the other things that come in handy when away from the hotel.
I'm not sure the description explained the pockets well, so I'll give it a shot. The zipper to the main compartment is a bit over 11 inches. Within the main compartment is a sleeve or divider good for holding a small tablet (the electronic kind) or notebook (the 5"x7" paper kind). The zipper on the secondary compartment is about 6.5 inches -- my phone is 6.3 inches long with the case and it fits fine. That compartment is also the perfect size for a passport.
In addition, there's a third tiny zippered pocket on the strap. It seems to be designed for holding a debit/credit card, a hotel key card and/or currency. It's not big enough for a smartphone, although you could put earbuds in there. The tiny pocket can be accessed easily when wearing the backpack on the back. The entire backpack can be swung easily to the front to access everything else (the zippers are then on top) or to hold onto in areas with a chance of theft. This pack is designed to be worn on the right shoulder, but it's comfortable enough on the left shoulder even though the pack hangs at a strange angle that way.
I'm looking forward to using this! It seems to be built to last, just like my regular Patagonia day pack, which has lasted forever