I always keep my original packaging I get things in. Why? I sell a lot of stuff online so that original packaging, made just for what you're sending, will protect it wonderfully.
If you don't have the original packaging, I suggest putting the ram in separate anti-static bags, taping the two back together so they don't back against one-another, and then putting the sticks into a small box filled with crunched up newspaper. The ram is light enough that newspaper works great, but it's small enough that packing peanuts might not protect it well enough.