timdonaldsonwrote a review of Orvis Safe Passage Sling Pack on December 30, 2014
Have now used my Safe Passage sling a few times and I really like it.
Pros: Sling is best possible design when compared to chest packs, waist packs, etc...easy to access but completely out of the way when not in use. The Safe Passage has zingers with magnets so your nippers are always where you need them, and a great attachment for a tippet spool (not included). Maybe the best innovation is the magnetized hemo pocket on the chest. The black/grey camo is subtle (the image above shows last years colors).
Cons: so far my biggest gripe would be a lack of a second pocket, or a divided pocket, so I can put keys/wallet/phone away for good while fishing. I like to keeping fishing gear separate from non essential items, so a small flat pocket to accommodate these items would be great. I also wish this bag was 10-20% larger, to handle a few more items. That said, I tried on the Guide sling and it seemed a bit too much volume.