Yeah, my day hike loadout can be a bit heavy, maybe 15 lbs or a bit more! But I like to have a pair of 40oz steel water bottles filled to capacity which is probably at least six pounds of that weight. Of course, it gets lighter as the day goes on and I drink the water. Generally I'm in areas where I can resupply but I like to be prepared for anything. The last time I spent an unplanned night out I drank 1.5 bottles and used the last half bottle to make sure my fire was cold out when I got picked up.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman