I consider the Hidden Storage talent to be badly written. The way it interacts with the size of the container and the ranks of the talent is poorly explained. I am using the following house rule in my game:
Hidden Storage allows the character increased proficiency in concealing items. It applies whether the objects are stored on the character's person, in his vehicle, or simply in an unattended object (like a desk or a crate). For each rank of Hidden Storage, the Difficulty to find objects that the character has hidden is upgraded by one, Finding hidden objects is usually a Perception check against the character's Stealth (for objects hidden on a character's body) or Skulduggery (for objects hidden in vehicles or objects), and the relative sizes of the objects can apply modifiers to the test as per Concealing Gear, page 153
Examples:
A thief with Agility 3, Stealth 2, and Hidden Storage 2 is hiding a blaster pistol on his person (within his heavy clothing). The difficulty to detect the hidden weapon would be RRP upgraded to RRRP because of Hidden Storage 2. If it were a heavy blaster pistol, the searcher would gain a Blue die, but if it were a holdout blaster, the searcher would instead suffer a Black die.
A scoundrel with Cunning 3, Skulduggery 2, and Hidden Storage 2 is hiding contraband on his ship. The difficulty to detect the hidden contraband would be RRP upgraded to RRRP because of Hidden Storage 2. The same scoundrel hiding an object on a ship with smuggling compartments (+2 Difficulty) would result in a difficulty of RRPPP upgraded to RRRRP with Hidden Storage 2. Needless to say, smugglers can benefit greatly from smuggling compartments, but skilled smugglers don't necessarily need such compartments to hide contraband.
Note that I think that Skulduggery (a Cunning-linked skill) makes more sense here than Stealth (an Agility-linked skill) for hiding objects in relatively static positions. Hiding contraband has far more to do with cunning and criminal thinking than it does with any form of bodily motion (exception: hiding items on your body).
Edited by HappyDaze