the present invention is a modular truck bed storage container which is attachable to a second storage container module to form a single storage system which can span the truck bed and has an upper surface for cargo support that may span the truck bed and in which the upper surface may replicate the configuration and / or appearance of a truck bed liner . the modular truck bed storage container has a removable sliding drawer . each modular truck bed storage container is reversible in orientation to fit the asymmetric configuration of each side of the truck bed . a variety of accessories may be conveniently attached to the modular truck bed storage container .