Waterproof Cycling Ruck sack / Rucksack / Back pack / Backpack / Backpacks

Things you can fit into an Ortlieb Velocity:

• a sixpack of German Beer, 0,5l each.
  
• 1kg of Haribos in a box
  
• 1,5l bottle of non-alcoholic drink (to fight the hangover)
  
• 2 boxes of chocolates
  
• rain jacket
  
• keys, lights, misc. stuff.
  
  

I like this backpack. But all that stuff is really pushing it. 20l isn't a lot appearently