I like the pelican but I would need something I can take with me to destination weddings...
Many Pelican cases have gaskets around the rim and seal shut when you latch them. Most models are water resistant if not waterproof. For extra $$ you can buy "Hurricane Proof" models that are supposed to be 100% waterproof so long as you keep them sealed.
They also make "Mil. Spec." versions that the US Military uses to transport and store equipment.
All Pelican cases I have seen are lockable, secureable with anti-theft cable and are very difficult to break into even though they are made of plastic. (It is very heavy plastic!)
You can buy Pelican cases that are airline approved. If you are so inclined (I am usually not) you can slap an ID label on them and check them as baggage or ship them as cargo via Fed-Ex/UPS without any extra packaging.
If the military uses Pelican cases to haul their "valuable" equipment half way around the world, there's no reason why they can't stand up to virtually any use or abuse you would put them through, photographing a destination wedding in the Bahamas!