Have had a couple of cheap types in the past but never seem to last. Looking to buy a good quality hydration pack, not too big but need to carry essential kit, ie 2 tubes, pump, levers, multitool, waterproof layer and jelly babies as a minimum.
Any recommendations please.

some are discounted here…. http://www.cyclestore.co.uk/rangeViewer.asp?categoryID=997

I have had a few Mules and the 2011 one I got in Feb is the best by far.

Not cheap, but Inov-8 packs are superb, incredibly comfortable and light. The bladder is in the base and goes around the hips, so very stable.