In an online art forum the question was posed regarding how to ship artwork – thought I would post my response here in case it is helpful to any readers.
I have shipped as large as 30×45 without issue. If you get your prints done by a lab, just keep the packaging they provide when the ship it to you. If you print your own, get packaging from ULINE. You could also ship them in the gallery pouches that frame destination provides, but personally those are too expensive for me to use as shipping/packing materials. (I do use them to transport my work for shows, but not for shipping to clients.)
I ship 30×45 that I print to clients using a new FedEx box – I put the wrap in a plastic bag, then put it in the box – it has an internal cardboard frame made to protect artwork, which is pretty rigid and protects well. I seal it up pretty well with cardboard pads from Uline on both sides. I tried to find the FedEx box online, but it was not listed anywhere. I purchased the box at a FedEx Kinko’s ship center near me for $12.99.
Shipping cost of course depends on where your are shipping to/from, but I found it to be pretty inexpensive after I opened up a FedEx account – I ship these FedEx ground for pretty cheap within Texas.