MorScan E-Track Storage Bins with Single Slots Feature A Enhanced Connector Portable & Versatile E Track Organizer Keep Your Cargo and Tools Neat & Organized Reliable and Easy to Use E-Track System Parts & Accessories Portable and versatile parts and accessoriesEasily accessible when neededCreate an orderly system for your cargo or tools, ensuring they remain secureGreat choice in trucks, trailers, cargo vans, flatbed/utility trailers, pickup beds, RVs, warehouses, garages, workshops, etc. What is the volume & loading capacity of the storage bins? About 518 cubic inch (0.3 cubic feet) for each pack, safe working load limit up to 200 lbs. What is the upgraded connector? Feature a enhanced connector for more stable, the backup connection plates were upgraded to 4 screws holes. We provided it as GIFT if you order the storage bins and the plates (ASIN B0D9RP4L1Z) together.