Maybe I have a weak mind but I use what is called an assault pack by Bianchi. I carry a minimum of a half gallon of water and tools, patch kit with spare tubes. I have ridden from 5 miles each way commute to 52 mile rides and it has NEVER been too heavy. It always gets lighter as you go if on a club ride. I eat and drink a lot while on a lengthy ride. I guess I'll have to try the Katy trail and get back to you guys about how the hydration pack does. Blues Frog