I've just bought my first hydration pack as I figured it would help me get out further afield in terms of my cycling and allow me to explore more. Currently my longest ride is 1.5 hours and a water bottle is just about sufficient. I want to ride for longer and carry food, tools, etc., with me, so I learned a little about hydration packs. I found one that seemed to be small enough to be comfortable to wear, yet large enough to support rides of longer than two hours. The one I've bought is an Osprey Raptor 10.

So for those who use a hydration pack, what pros and cons have you found and any useful tips would be great!