Best rear bag for CAR/M4/SOPMOD stocks?

I have just been resting bottom of stock in my hand on top of a homemade sand bag.

Does anyone make something more stable?

I have been using a homemade bag for a cpl. yrs. now, but recently started to use my new shooting pals rear bag and It’s damn nice. Super stable.

I’m gonna get the name of this rear bag from him today in a few hours when we meet up to shoot, and I’ll post it up once I do.

My pal’s rear bag…

My shitty DIY rear bag:D…

I use a couple from Sniper Pro Shop in Tennessee. The come in different colors/camo and have molle and other neat features.

http://www.sniperproshop.net/sniperproshop2011a_003.htm

I first started using them in 2007 and tossed out my homemade ones.

I like a bag with straps to assist positioning and squeezing with the support hand, like this, which allows positioning either across the width or length:


http://www.midwayusa.com/product/745362/midwayusa-tactical-rear-shooting-rest-bag-nylon-olive-drab-square