It's made by Duluth Pack and it's on sale now!! To see it go to http://www.duluthpack.com/sub_shoulderbags.aspx.
It's the Mini Haversack. It's dimensions are 8" high, 8"wide and 4" deep. It's cotton duck with leather trim, adjustable leather strap, sturdy brass hardware and it comes in 6 colors. It has 6 inside pockets and will easily accomodate a standard Peterson or Kaufmann field guide, in addition to maps, pens, small flashlight, notebook etc. My Nikon's fit inside with room to spare. In fact, I keep them inside their original case inside the Haversack! I have the flap folded back. It gives them added cushioning and acts as an insulator on hot days.
The current Sale Price is $56.00. There is a larger version (11" high) on sale for $66.50 and there is also a luxury leather version available for Leica, Swarovski and Zeiss owners
The mini haversack will easily accomodate a Swift 8.5 x 44 820 inside with room to spare. 2 32mm roof prism binoculars will also fit inside albeit not with their cases.
It's remarkably attractive, lightweight and easy to carry around. Get one while they last.
cordially,
Bob