The XL Haversack is approximately 16" x 16" and is large enough to hold your equipment for the day. It is a single pouch with no pockets or extra frills, just simple function.
 
It is also capable of being attached to a roycroft pack frame by utilizing the heavy duty strap on the back of the bag. This Haversack also features an integrated and adjustable 1.5" wide cotton web shoulder strap.