Review on CamelBak Podium Flow Bike Hydration Belt - Stay Hydrated on the Go with Easy Access Bottle Pocket - Includes Podium Dirt Series Bottle - Convenient Adjustable Waist Buckle - Secure Zipper Pocket - Ideal Riding Belt - 21 Ounce Capacity by Christian Byrd

Have used this backpack for several mountain bike trips. It is excellent. Between this backpack and a water bottle mount on a bike, I can hold 42 ounces, which is enough for a 2-3 hour ride, or longer if there's room to refill water. The backpack sits well on my waist and barely moves when attached. This makes my back sweat and keeps my center of gravity low. The bottle is easily accessible on the right and is held securely. I can pack basic items in my backpack so I don't get into trouble; Multi-tool, chain tool, extra chain links, derailleur hanger, cable ties, pocket knife, tire levers x 2, bill to clean sidewall, car key and phone in a sock to avoid scratching the screen. I have a frame mounted pump and hose attached to the bike frame. This is the perfect setup for mountain biking when you don't need a backpack on your back.