The Perfect Fly "Raven Fork" Sling Pack is an alternate to the fly vest. It can carry everything a large fly vest can carry and even more. It includes a special slot to hold your landing net. The back panel has a mesh lining to keep you cool. The shoulder strap is vented, wide, and padded, so that it distributes the load equally and comfortably. It is adjustable so that it will fit any size person.
The Sling Pack easily swings around so that nothing is in front of you to interfere with your casting and fishing, or the opposite way so that everything is convenient you can easily get anything that you need. There are plenty of places to carry various size fly boxes.