I primarily mountainbike and every Saturday and Sunday our little gang prefers...no-requires very long rides in as remote locations as we can find. 5-10 hour duration is typical for a weekend ride, lot's of hike a bikes etc. We all use Camelbaks with 100 oz bladders and typically carry go-juice in 2 water bottles.
25 years ago we had fanny packs with bottle holders to carry the spare gear, maps and extra water. Those fanny packs were even more uncomfortable than the loaded camelbak. For the road, no camelbak needed and it is nice to ride without the weight on my back. FYI-I would rather suffer the camelbak and be off-road than wrestle with cars on the road bike without a camelbak.