I have this the Kool Stop tool:

http://www.amazon.com/Kool-Stop-Tire.../dp/B001AYML7K

I used to bring it with me on rides, but then I found the VAR tire lever, which is smaller so now I keep that in my bike bag and use the Kool Stop at home.

http://www.amazon.com/Var-High-Press.../dp/B004ETKDAA

However I don't know who sells the VAR lever these days.

Both tools are lightweight plastic, it's just that the Kool Stop is a bit larger.