I run the alps vantage bino/chest harness. Holds at least 3 diaphragm calls, pot call and 2 strikers (I carry 1), I can also fit a small trumpet call, and a wing bone call. One of the side has a rangefinder pouch attached to the molle. There is also molle webbing on the bottom. I carry 8x32 binos bc I hunt thick brushy swamps. Without the binos you could fit quite a bit more gear if you wished. For a sub $100 pack it holds up. Very lightweight, and comfortable. It comes with a Molle box call pouch also. If I'm going all day I'll pair it with the alps little bear fanny pack. It's been my go to rig for the last 4 seasons or so.