It looks like you're new here. If you want to get involved, click one of these buttons!
Daz - probably a bit far, but you could always tie it in with a training weekend - Likeys is always your best bet, over in the lovely Brecons...
I've got a Salomon S Lab Skins 12ltr back pack if you want to try it on. I know its not a 5ltr but would give you a feel
I also live in Teddington so could drop it in to you if you are interested
try online - Chain Reaction Cycles and Wiggle seem the best for price.
I just bought Salomon Speedcross 3 from CRC for £50 (Price in shops £90)