If you’re tracking a much-anticipated online order, you might see your package arrive at a carrier facility. And then it might just sit there, sometimes for several days. That could mean that the delivery company is overwhelmed with boxes, so there’s a backlog in getting them on trucks for delivery. A shortage of delivery trucks or drivers could also cause the bottleneck. During peak shipping times, such as during the holidays, deliveries sometimes take longer to arrive because the system just doesn’t have the capacity to transport all those boxes.