The new Raider Rear Bag from Low Vis Gear can be tethered directly to your rifle thanks to the adjustable and stowable QD sling strap.
It’s manufactured by SORD from ATACS iX pattern 500D Cordura. The filling is Spexlite 5064 and the amount can be adjusted thanks to the food-away fill funnel.
www.lowvisgear.com/en-us/products/mk4-fox
I think you mean ‘fold away fill funnel’ though it may be worth keeping because it was enough for me to go to the website and check out the rear bag.
Another great bit of kit from JB at Low vis