We work with a wide range of carriers who put their shipping rates on our marketplace ready for you to book using our shipping calculator. At the time of writing we do not have a courier who can collect over the weekend, but you can of course book a drop off service. This will allow you to drop off at a local FedEx or USPS store within their opening hours.
For those who need to ship a package at the weekend this is a perfect solution. You can use this for international shipping and domestic courier services too. It might be a federal holiday, but most locations will still be open ready for you to use.