I look at buying a vest every year-- then I don't buy it. I don't know about you, but I would eventually have something in every pocket and it would weigh 80 pounds. I stick to a fanny pack because I want to force myself to minimize my gear. I just take it off when I sit down. It only takes a few seconds to put it back on. If I need to move quick, I sling over a shoulder. BTW I saw a new design this year contoured to be carried over the shoulder or like a bandolier. It has a velcro closure if you want to carry it that way for easy adjustment. It was designed for turkey hunters so access to calls and such looks easy. I haven't put my hands on one yet, but it looks like an option. I can't remember who makes it, but I saw it in a catalog, so most shop owners should know what it is.

Watch out for periscopes!