The present disclosure relates to a collapsible storage system that may be mounted in a fixed position and attached to the vehicle using its tailgate without the use of any tools. The collapsible storage system may be used to securely store items in the bed of a pickup truck while in use and may be collapsed into a configuration that reduces the amount of space in the truck bed that the storage box occupies while it is not in use. The collapsible storage system may be mounted a diverse array of different trucks and other vehicles having tailgates and may be installed and uninstalled without the use of tools.