the storage device is a device used in pickup truck beds , for the purpose of protecting items from the outside elements . the two main elements are the compartment , and the lid . the compartment and lid are made of materials such as sturdy lightweight injection molded plastics . the lid is ribbed across the top to add strength . the capacity of the compartment is approximately the same as the trunk of most small to medium size cars . it has a metal security tube system with locks , and rubber boot suction cups in the front and back of the device , to prevent theft or unauthorized removal from the bed . the lid has a front end locking mechanism that secures the contents . the lid is hinged at the rear end , allowing the lid to be opened and closed , from the tailgate area of the truck bed . a metal rod in the lid , allows the lid element to be raised to various positions as desired , when putting items into or taking items out of the compartment . the storage device is a portable device .