I have two different lumbar paks that I use...one is a lumbar camel bak pack....it's great because i can use it when running or riding....it is comfortable, and has a place to put my keys, ID, a snack, and cell phone, plus holds TONS of water....the other one I have holds water bottles - again comfy....a little tougher to get the bottles out though to drink, but i like that i can hold a snack, some water, and my keys and stuff. my preference is the camel back for loooong rides.....but that's just me....and i'm one of those folks that HAS to drink a lot of wter....otherwise i get too tired