I don't want to go through the hassle of reaching down to a bottle and putting it back while I ride so a hydration pack was my only consideration.  Camelbak is the most well known but there are others.  Get at least a 70 oz. pack to give you enough fluids for a good ride.  If you plan to do any long rides then you may want a 100 oz. version.  I have the Camelbak Classic which has a small pocket I put my phone in.  You can get them bigger if you want to carry more stuff.  I don't notice it on my back once I start riding.

I have been using a Deuter Race Air Lite for a few years and have been happy with it.  The mesh suspension allows for airflow between your back and the pack which is really nice in our hot humid summers.  By comparison a Camelback feels like a soggy wet diaper sitting on my back.  I prefer the Camelback bladder and bite valve over the Deuter version, and the 100oz Cambelback bladder fits nicely in the Deuter pack.  I am pretty sure a 70oz if that's your preference would work too.

1. I've always used a Camelbak. I havent used bottles. Lately I knoticed I'm drinking less water on shorter rides and have considered trying out bottles.

2. I guess it would feel heavy if two bottles feel heavy. I don't really notice it, it's all I have ever done.

3. There are a lot of brands. I assume it's preference at this point.

4. Having a pack it a place to put other crap for longer rides. Carrys food, tools, basic parts. I have two different camelpaks. One is smaller with just 2 small pockets I use for most rides. My second Pak is much larger for long rides/day trips.

My only suggestion is to try one out. If you know any one that would let you borrow it for a ride, see if it's something you can get used to.

Another thing to do is consider how you ride. They make some of the smaller packs without a waist strap. Those are fine if you aren't very aggressive on the trail. If you are... it gets pretty annoying bouncing around on your back.

I appreciate each and every one of you for your insight. That is what is great about this community. 

I purchased a pack on price point. 

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Its not a camelbak but all around great price and i think it will get the job done. Would love to hear your thoughts. 

The rides around here aren't long or remote enough for me to carry water.