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I recently bought a Camelbak Flashflo. It's great in terms of not having to carry bottles of water about and actually having somewhere to put my house keys (I won't tell you where I kept them before, save to say I don't think anyone would have mugged me for them).
The thing is, I can't seem to stop it from jiggling about. I've never had one before, so I don't know if this is normal and something I have to get used to, or if I'm doing something wrong. If I wear it on my hips, it just ends up jiggling up to my waist, and if I wear it on my waist, I have to really tighten it to stop it moving which is quite uncomfortable. Pretty much all the running I do is hill and trail, so I'd like something that fits quite snugly.
Any tips? Apart from Mr.W's suggestion that I 'eat more pies'