I have tried both belts and Hydration packs for Marathon training, and find the belts bounce around too much. I have settled for a Gelert Force Hydration Pack, which is pretty comfy and has pleanty of room for Gells, jelly babys, Phone, keys ect. Can pick them up for under £20.  

i tried a few in a shop and found them awkward. they looked like they would loosen up as I ran. When I get round to it, I will get one of these camelbaks - particularly for my 15k cross-country event!

http://www.simplyhike.co.uk/products/Camelbak/BreakerHydrationPack-Black.aspx

Im looking for a belt to carry my drinks bottles,gels etc for when i train for my first marathon.

Can anyone recommend a good one?