I had a issue with uploading my artwork to sell on Threadless, and reached out to their customer support service. What I learned may be known to some of people, but it was new to me, and I want to share it with you so your uploads will look their best!
Redbubble has provided .PNG and .PSD templates for their mugs, but I found them to be lacking in some key areas. I've made some new versions of these templates so you can make even better print-on-demand products.
Redbubble has added two new products to their extensive range of print-on-demand-ables -- backpacks and duffle bags. Before they released official templates, I quickly whipped up some for you all, so you can get on preparing your new products ASAP.