You really shouldn't need a backpack or Camelback for a 50-mile ride, especially if you are finishing it in three hours. Two bottles on the bike and one in a jersey pocket should be enough. Put your CO2 and spare tube in a small saddle bag.

And, if you do need water, just find a place to stop and fill up. I will hit convenience stores to buy more fluids or stop by a fire station or church that has a hose to get water. But that only occurs on 60+ rides. There really is no need to stop for anything other than a pee break on a 50-mile ride.

Oh, and stop checking email when out for a ride.