Waist Packs are alternates to the fly vest. The "Perfect Fly" Waist Pack is one that can carry almost everything a large fly vest can carry.The Waist Pack's shoulder strap is very wide and padded so that it distributes the load equally and comfortably. The back has a strap for attaching a landing net. The waist pack can also be worn using the adjustable waist strap. Both the waist strap and shoulder strap can be used but either one of them will support it comfortably by itself. The back of the waist pack is ventilted so it stays cool and comfortable against your waist.There is a foam fly storage compartment inside the front zippered pocket. It will hold up to 120 flies. The adjustable shoulder strap is wide and padded.It support the weight of the small waist pack comfortably. The adjustable waist stap also will carry the pack comfortably. Some pockets are lined with vinyl so they can be cleaned.There are numerous places to attach about any device to the waist pack that you can think of or would ever need for fly fishing. They consist of various type of rings, eyes and retractable snaps.