This smooth metal case protects its contents from all but themost devastating damage.
Wondrous Item 25,000 gp
The invulnerable case can hold one item the size of a large book. It opens easily to the touch of one wanting to access its contents, but otherwise stays closed despite any external forces acting on it. The case has resist 30 to all damage and 100 hit points, and it regenerates 10 hit points per hour. As long as the case has at least 1 hit point, any item held within it is immune to damage.
Published in Adventurer's Vault, page(s) 173.