Modular storage system with storage bin connectivity and external bin features

The present invention provides a modular storage system consisting of connectable heavy storage bins, slat bins, rolling racks and/or carts, work surfaces, organizers, trays and accessories for storing and organizing internal and external items and facilitating pick-and-place for use and transportation, the modular storage system is scalable, customizable, and easily adaptable. The storage bin has lengths, widths and/or heights of different dimensions and has a universal bin-to-bin connection system for stacking and connection to mounting accessories. The bins have removable, customizable tissue inserts (e.g., dividers, storage trays, bins, alignment trays for bins, and bins of different sizes). The box cover rib grid with bosses and undercuts expands the internal organization, including cooperation with dual-purpose separators and accessories. The bin has an external mounting attachment to expand external tissue. Different containment modes, including wall mounted systems for walls or sides of trucks or truc