Milk crates zip-tied together on their sides so that a bench seat fits on top and red bins from Lowe's can slide inside them. I don't have any milk crates, though. I also don't know what "zip-tied" means. I would use different colors.
*** Love the wood pile Table*** Easy DIY Outdoor Furniture Projects! -- Love the cinder block bench! It would be so cheap and easy to build; then find outdoor cushion and pillows for patio furniture to make it functional