I have tried fanny packs worn in front and waist belt pockets - Six Moon Designs, McHale and Gossamer Gear.

What works best for me is the zpack pockets on a separate 1" web belt.

http://www.zpacks.com/accessories/beltpouch.shtml

The pockets and web belt weigh 2.3 oz.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra