Pretty decent! In fact, it was hard to detect where the zipped compartment was. After I found out, I kept going and there was another zipped compartment O.o . Pretty nice product - a good buy!
The zipped cannot hold large currency notes (I tried it with Canadian currency notes but it didn't fit). So, I put the cash in the main compartment instead of the zipped one. The zipped compartments can hold credit cards, pens, business cards and folded air tickets. The main compartments can hold cash, passport, boarding passes etc.