I've never been a fan of photo vests/jackets. They sound good on paper, but I've yet to find one that didn't just feel awkward once you loaded it up (at least with what I would typically take for wildlife). There's also the question of what to do when it's too hot to want to wear the vest/jacket or so cold that you need something heavier. Any vest that fits over my heaviest cold weather gear is going to be way to big to wear on its own in the summer. I prefer to keep my carrying systems independent of my clothing. Dress for the weather first, then select what bags or packs to take based on my immediate needs. I like to use my Gura Gear Bataflae 32 when I'm not traveling far from my vehicle, and when going farther afield I use a Kinesis long lens case with belt and harness (and other lens cases on the belt as needed).