There is no assembly required! There is no need to assemble the totes 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 totes 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 tote out of its stack, place the first tote on the dolly, and start packing. When done, close and lock the lid, and you are ready to put the next tote on top. No taping and no fuss!