I started out with a Dromolite bag but sent it home. The thing I didn’t like was that I couldn’t see it (since it was inside my pack, with only the tube sticking through the little hole made for that purpose), so I couldn’t know for sure how much water was left. I prefer bottles. So I stop my forward motion for a moment to take a drink (although, not always). I carry 1-liter soda-turned-water bottles (or bottled water bottles are fine), which are lighter than Nalgenes. Also, I use a Dana wet rib, a hip pouch, for easy access to a water bottle, maps, munchies, etc.
I think it’s a good idea, myself, to have a backup bottle juuuuust in case the hydration system runs low or runs out and you’re not right near a source. Just my opinion.
ramkitten
ramkitten