Are you sending a gift to a particularly robo-tastic friend? Take a gander at these shiny silver mailers that I'm hand-customizing with cut out Red Robots to any order for just five bucks. You can also add a "from" message in the order notes when you check out.
These are big mailers that will accommodate up to four t-shirts + two pairs of socks, eight pairs of socks on their own, or most other combinations in-between! (Not compatible with Red Robot plush or shotglasses.)
You can use all classes of mail with these in both the USA and internationally. (First-Class, Priority & Express)