Bikepacking is the new thing, think long distance single track touring. A staple of this is the use of different bags that utilize free space on the frame without the addition of racks that add weight and position your gear in the way of snags.
Porcelain Rocket is one of the leaders in this field the product I chose to show is the Mr. Fusion v2. Reason I chose it is that it could be a solution for many commuters and day trippers. You don't have to do The Tour Divide(over 2000 miles along the Rocky Mountains) to utilize the extra storage and because of the mounting system you don't need to add a rack.