Many e-retailers and 3PLs use an integrated reverse flow on a driven roller conveyor in the picking area. A Pick-to-light, that is. By allowing the products to be moved to the operator, instead of staff going to the right shelf, you can quickly optimize the flow.
This creates a new level of productivity and picking speed. However, when picking is fast, a large buffer of empty boxes is required to never stop. Empty boxes take up a lot of unnecessary space. Imagine that your business needs 200 bins to keep an efficient pick-to-light running. A standard plastic Euroback is 800×600 mm. So you need 120 meters of runway to buffer all your empty bins.