This is a small bag. Don't expect to fit anything more than your spectacles, testacles, wallet and watch in it.
Plus your ipod, diary - maybe a paperback at a squeeze.
I use the hook to hang my water bottle from aswell, but I don't think of this as a bag - more a man-purse (snigger). To carry shopping or whatever, I would use a proper bag - and Visconti has much better bags for carrying laptops, ipads, books or whatever.
I've been using this bag for 4 months now and find it to be very well-made. The thing I like most about it is the way the strap is designed - it sits really well across my shoulders and is very comfortable.
The leather is pretty 'raw' and, as the warning it comes with says - it can rub onto light clothing but this is the nature of proper leather.