a sturdy weapon harness

This harness is built to hold larger weapons than a normal harness. It is meant to be worn on the back and has several leather straps to adjust for height. There are metal rungs attached to the harness that are meant to further secure the weapon.

It is a sturdy weapon harness.
It weighs a couple of pounds.

You identify a sturdy weapon harness.
It is a sheath.
It weighs one pound and ten ounces, and it is worth about two celeb.
Its keywords are harness and sturdy.