GSI used to make a green lexan french press. The green one was much lighter than the black one. I just looked at REI website and they no longer sell the black one either. I prefer Folgers Gourmet Supreme from a french press.
I bought one of these for solo trips but have not tried it yet.
http://www.rei.com/product/792857
I also have taken instant on backpacking trips but I have to be really concerned about weight before I settle for instant.