My pack, before water, might weigh 3lbs. May be a pound or two more with cold weather gear. Call it max 11lbs with water and cold weather gear.
If you went cheap, generic or off brand, you might spend $100. The gravity water filter being the biggest cost. But I would rather go for a few bucks more for quality. Especially if my life might depend on it.
I use the head lamp, the flashlight, the Ka-Bar all the time in other functions in and around the farm. They get well used.