Since I've gotten some questions on it...
The service will not stack with a container that already has the script. The greater value (50% here) will apply.
Nothing that holds more than 200 pounds will be accepted for the service.
There is no cost for "plain" containers. By plain, I mean things with fluff scripts and normal or epically deepened capacities. If your container has some sort of functional script (ie: self charging magical item, once a day weight reducing backpacks from Black Swan, teleportation cloaks), enhancive properties, or other things that make it incredible, there will be a charge assessed based on those qualities.
Yes, it will play nicely with pretty much any other script that might be on your containers, including the ever-popular Climate Wear (TM!), and feature concealing cloaks.
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GemStone IV will be up shortly!
Sorry guys, my bad :(