Primary use: As a rear bag
The vast majority of those who use this bag will use it as a rear bag to stabilise their weapon when sitting or prone. The cuboid shape coupled with the compressible filling ensures perfect barrel angle continuity. No more "too high or too low": the compressive nature of the bag allows it to adapt to almost any situation.
Proper use
Position yourself behind the rifle, get into a comfortable position behind the gun and press on the bag until you feel it push against the stock.
If the force required to compress the bag is excessive, you can relieve pressure by adjusting the bag's tension strap.
A PRS rest?
This bag can also be used as a small PRS bag, placed under the gun barrel and held to your gun with the strap for added stability on barricades.
Its design makes it abrasion resistant, and it will accompany you for a long time on PRS courses.