Fishpond Waterproof Sling Pack vs Hip Pack vs Backpack // Which One is Right for You?

Thoughts on bags. I've used all types and here are my thoughts on my sling pack, vs. hip pack, vs. backpack. Products used are the Fishpond Thunderhead Submersible Backpack, Lumbar, and Sling along with the Fishpond Wind River Roll Top Backpack.
Links to Products:
Fishpond Thunderhead Sling: redsflyfishing...
Fishpond Submersible Backpack: redsflyfishing...
Fishpond Submersible Lumbar Pack: redsflyfishing...
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