the safty features on this bag are just perfect, as most of pacsafe products, what i want t say is go for this size, if you are traveling and want to have your:

passport, 3-6 credit cards, 2 phones, one small digital camera and 2 pens, each of that in its own pocket inside the bag, also u can put small map, and ciggerts and matchs, u still have the outside zipper for small cash notes and fast access items.

it has great anti theft strap but u could also fix it by ur normal waist belt and it looks pretty cool, don't buy the bigger sizes unless you need to stuff more items, its the perfect size