What camera do I buy? / general gear talk

Any recommendations for a nice camera sling?

• Space for a full frame camera and a spare lens or two
  
• Comfortable to wear for longer walks, as well as days out etc
  
• Waterproof would be useful, but not mandatory
  
• Over the shoulder sort of design rather than a back pack
  
• Bit of webbing etc to attach a waterbottle / small tripod too if needed