A plce bergen , approx 45 l berghaus hot rock, 10l hydration pack (like a camelback) are the ones i use most. Which one i use depends on what I am doing on the hills that day. Over the years I have tried and tested others and still have a few up the loft but these sizes work for me. I know they are on the large size but the bergen is just the right size for all my creatue comforts for an overnighter, the berghaus works all year round as a day pack (even if it is too big in summer) and the hydration pack I got to try out for short bimbles where a FAK , munchies and water are all I need to carry. Lets see how it works out.
Greg
Greg