I run the vortex guide pack, you can adjust to about any height (lower on chest if I'm using my bow) can fit most bino's as well as a few rounds and range finder in the front pouch. I put my phone in the back zip pouch with ID if on public land. side pockets hold a spare battery for the range finder, a lil lighter, lil puff bottle, screen wipe. The top elastic pockets hold a compass and if i have one on me a mini map.
With all that it still weighs sod all.
Oddly my favorite part of the chest rig is that it has a flat top, I rest my rifle across it when hiking as i try to minimize using the sling. lost way too many dinners because of laziness.