I've used a few different rear bags, ranging form lightweight DIY things to a decent make heavy bag.
Best I've used (and currently use) is this:
https://www.shortactionprecision.com...-run-n-gun-bag
Really light weight, light enough that you can clip it to your rifle and not notice it's there.
Can be used on different ends of the bag for different heights.
And comes with a sling swivel so it'll mount to a sling stud, or can attach to you bipod/forend.
Despite being light weight, whatever the fill is makes for a really solid support that holds its shape well. I had a few home made polystyrene filled bags and found a real pain as they wouldn't hold the shape you put them in and would try to spring back to their normal shape.
Best part was I bought from a NZ supplier and the price was cheaper than it would've cost me to buy from the USA, without having to wait ages.
Got it from this place: https://gearlocker.nz/shop/sap-run-n-gun-bag/
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