The Fish pack is based on the original Chouinard Equipment Fish pack. Introduced sometime in the early 70's. 

Features:

• available in 12 Oz orange Cordura to match the color of theoriginal or 16 oz Ballistic nylon, in Red or Royal Blue, to match the original fabric.
• 2 full-length haul loops
• zippered lid pocket on the underside
• removable webbing belt
• adjustable/removable sternum strap.
• You can see some of the most popular custom options here.