I have a Field & Stream bag I got from Dick's Sporting Goods last year for $30 or $40 and I really like it. I has two side pockets for carrying water bottles, it is made to carry a water bladder like a CamelBak but the bladder did not come with the bag, and has several useful compartments.

But as much as I like this bag, I want something bigger. I have my eye on the Rush 24 pack by 5.11 tactical. It doesn't come in camo but you can get it in tan, black or OD. It is large enough for me and has the MOLLE system to attach other pouches. It is $100 plus I will be getting some pouches so I will probably have over $150 in it.