I have one of the smaller Camelbak waist packs that seem to always be on sale; I guess because not many people use a waist pack. I think it only holds 45 oz, but for most rides, that's plenty for me, and I can always take a water bottle for Gator-aid or whatever if I think I'll need more. I love my waist pack! It has a zip pocket for those all-important Payday bars (and my cell phone), but that's it for storage. It feels heavy when you first put it on, but once on the bike, I never even notice it. And it's a lot cooler than a backpack-type Camelbak (important here in the steamy southeast), with no strap irritation.
For hiking I have a REI WSD hydration day pack (regular shoulder strap model) and love it, but it would be too bulky (for me) on a bike. It has a 70 oz. bladder.
Emily
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow