In reply to mattrm:
I use a pair of carbon fibre Pacerpoles.
So light I don't even notice them on my rucksack.
They have totally innovative ergonomic grips too.
Plus I bought a cheap camera mount which only weighs a few grammes and turns one pole into a monopod for taking shake-free photos.
I also use them to support a tarp for keeping dry while bivvying.
www.pacerpole.co.uk