A V Hang Bag
The Hang Bag is a strong (but NOT PPE) sewn strap from which heavy loads may be suspended for greater comfort. It also facilitates carrying multiple tackle bags.
The material is durable 16mm tubular tape, secured with three lines of bar tacks (breaking strain when new, 50kg). It is designed to be threaded through the leg loops, and bags may be attached by clipping with a karabiner. This both creates a 'cleaner' front to the harness (in narrow pitches for example) and also potentially reduces rubbing of the inner thigh by the haul-cord of a swinging tackle bag. Not a pleasant prospect.