I use the AGC KISS pack. I was hesitant for a long time to go the full chest pack route. Some of the options out there are full on daypack size!
I've done the crooked horn, the stock strap, the paracord... I have a pair of 10x42 Leicas. I like the added protection of the chest pack when crawling and stalking. The stretch panels on the top hold my spot and phone, the mesh pockets on the side hold my wind checker and a call and my tags fit in the back pocket. Everything I need and nothing more. quiet, protected and east to access. Its a great pack.