So I am WAY behind the times on this, but recently have picked up hiking and backpacking again after a few decades off... For water I've always used wide-mouth Nalgene bottles (I carry 4-5 on a day hike). A few years ago I got a new Kelty day pack that has a pouch for a hydration bladder and a hole for the tube to come out. I don't own a bladder or hydration pack. I can't ever really see myself using just a hydration pack, 'cause I drag too much crap around with me when I hike, so I'm looking for recommendations on what type/brand/size of bladder I should get (if you can buy them seperately) and what everyone's experience is using a bladder inside a regular backpack (do they ever leak?). If it helps, the sleeve for the bladder is right against my back (pretty typical, I guess...). I'm thinking medium sized, and refill every so often when I stop and take off the pack?
