For those of you who use hydration bladders:

What brand do you use! What size? How do you have it set up in your pack? Do you keep it in the special pouch inside the pack, or do you strap it to the back?

I hate trying to contort myself to retrieve/replace water bottles, so I use a modified Camelbak bottle with a hose, but in trying to cut weight I'm going to look at other options.

Please refrain from getting into a bottles vs bladder debate...I just want to get ideas from bladder users.