While running with a hydration pack does it bother you?

I'm thinking of purchasing one and would like a little advice... How many ounces of water is good to have...Tips and tricks? i read about filling it up with mostly ice then little water it keeps water cool all day...To me it seem most only have shoulder straps nothing for your midsection so it dont flop back... show more I'm thinking of purchasing one and would like a little advice... How many ounces of water is good to have...Tips and tricks? i read about filling it up with mostly ice then little water it keeps water cool all day...To me it seem most only have shoulder straps nothing for your midsection so it dont flop back and forth ...What brands do u recommend for best quality and life span....?
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