I had to check (because I hate camelbacks) but I love the euro equivalent from Geigerrig
http://a.co/8uApHKQ mainly for the reason you cited .. and its a million times easier than a camelback to fill and clean (you just turn it inside out and toss it in the dishwasher)
The 100oz bladder + cut down hose and not including the pressure bulb which I don't take with me was 4.20oz
Not that it matters to me; All of my main rides are north of 50 pounds.
Quote from jayg on May 17th, 2017, 2:11pm:
SmartTube hose assembly w/plastic bottle adapter: 2.45 oz.
Small Camelbak bladder (empty) w/hose assembly: 6.85 oz.
I'm only going to be carrying a bottle of water for the last 10 miles of the East Side Ride. Filling a bladder at a Stop & Go is a pain in the azz, besides it won;t fit in the bag along with my other assentials.