We've asked our fulfillment partners to minimize shipping costs wherever possible. As a result this sometimes means it's less expensive for them to ship oddly shaped packages (think: posters in long tubes) or heavier packages (think: mugs) separately from other items, potentially using different carriers. Since carriers don't sync up with one another it occasionally means that part of your order may arrive a day or two after another part. If part of your order is really late, don't hesitate to contact us and we'll be happy to take a look at things from our end!