My wife and kids got me a Hydrapak Overflow (100 oz.) for Father's Day. I've used it on one longish ride. Though I was not all that keen on wearing a pack, it was nice having all that water. I also took some sports drink in water bottles. Unfortunately, my ride was not really long enough for the big pack. I've decided to wear the pack for rides I expect to be over 30 miles. Since many of my rides don't really pass by potential water stops that often, I suppose the pack was a good idea.
The Overflow has lots of room to carry stuff, so I will also be using it this August when we are hiking in Arizona.
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You're east of East St. Louis
And the wind is making speeches.