Since I typically use Walmart, Lowes, or Home Depot boxes I find it's convenient to keep a list of all sizes and dimensions so I can quickly refer back to it. If you have really good memory this might not be helpful to you, but since it's the last step in the shipment process, I like to give myself a break.

It's much easier to remember that Boxes 1-4 are Walmart Large and Box 5 is a Home Depot Medium than it is to remember the 3 dimensions for multiple sizes and which order they are in your shipment.

Here's a list of all four sizes of boxes from the big three places to get them. You can either print and hang it on the wall next to your computer or bookmark it for quick reference. Remember that for regular shipments, boxes can not be longer than 25 inches on any side. Home Depot's Large exceeds that so I only included it for reference if you have an over-sized shipment.