Montivagus said:If you're a minimalist 45-55 L if you like your comfort 65-75L if you're taking the kitchen sink and you can lift it 100-120.
Have a look at this thread to see what people carry and in what...might help? http://www.bushcraftuk.com/community/showthread.php?t=15436
Umm, my ruck is 28L. Must make me miserist then.