There is no assembly required! There is no need to assemble the bins because it is all one piece and ready to go. There are no separate lids, as they are attached. You simply unfold the flaps (lid) and voila, you are all set. The bins stack and nestle into each other, so that they take up less space.  They come to you in a stack, so you just take a bin out of its stack, place the first bin on the dolly, and start packing.  When done, close and lock the lid, and you are ready to put the next bin on top. No taping and no fuss!