When you're traveling, and especially when you travel abroad, you may find yourself struggling to decide how to carry everything as you explore. Short trips rarely warrant much in the way of checked baggage, but even a backpack can be heavy and uncomfortable after a while.
At the same time, there are a lot of things you want to have with you: a camera, water, money, and probably a map. Maybe you have a cell phone. Do you need to carry allergy medication with you? If the water isn't safe to drink, you might have iodine tablets or one of the newer ultraviolet water purifiers.
A lot of this stuff can be attached to your belt, but not all of it is stuff that you necessarily want to be visible. Cameras, in particular, are an annoying dilemma: you want to be able to take pictures, but you don't want to make yourself a target for thieves. (Yes, everyone knows you have a camera, just like they know you have money; on the other hand, making it obvious where these items are makes it more likely that someone can steal them quickly, and that's what thieves prefer to do.)
Cargo pants offer a good alternative to carrying your backpack wherever you go. The more pockets you have, the more space to store things without carrying them--but they remain easily accessible as needed.
Of course, having lots of pockets doesn't mean you shouldn't secure your valuables in a hotel safe. But pockets can help you keep a lot of things close at hand when you need them.
Oh, and here's a tip for protecting yourself against pickpockets. When someone in a crowd yells, "Pickpocket!", everyone instinctively reaches for his or her wallet to make sure that it's still there. Train yourself to not do this, because it's usually the pickpocket who's yelling--instantly discovering where each person is keeping his or her money.
And now, I'm off to Acapulco. Happy travels.