In a box blind the front of the rifle sits on the window rest, so rear support means a bag under the toe of the stock that holds the butt at the height your seat and the window set. Set the front on the rest first, then fit the bag between the stock and your knee, thigh, seat or shelf.
What sets the geometry in a box blind?
Three heights meet at the rifle: the window rest, the height of your seat, and the height of your shoulder when you are seated. The window rest holds the front. Your seat and posture decide where the butt of the stock needs to be. Change any one of the three and the gap changes with it, so check the set-up from the seat you will use.
That leaves a gap under the toe of the stock. Without support there, your shoulder and hand hold the butt up. A bag in the gap takes that job. Squeeze it to raise the butt, ease off to lower it.
Where does the rear bag sit in a box blind?
Under the toe of the stock, resting on your knee or thigh, on the seat or on a shelf at your side, depending on the blind. The Sling Steady Pro 9" is a rear shooting rest bag that sits under the stock, 9" × 2.5" and 9.5 oz, and it ships filled.
In our testing, shots landed 28% closer to the bullseye with Sling Steady under the stock, and muzzle rise was about 75% lower. It also helps manage recoil.
The bag ties into the rear QD point or sling swivel, so it stays on the rifle when you change seats or windows. A pack can do the same job under the stock, but it is bulkier and its height changes with what is inside.
Does stock height matter?
Yes. Stock height is how far the butt sits above the seat or your lap. A taller seat or a lower window changes it. Squeezing the bag raises the butt, and easing off lowers it. The hook-and-loop ports let you add or remove SteadyFill if you want the bag firmer or softer.
Does weight matter in a blind?
Less than on a hike. Once you are in the blind, a heavier bag is not a burden. As listed on 4 November 2026, one retailer lists the Armageddon Gear Game Changer at 7 lb with standard beads, and does not say whether that is filled or empty. That is well over the Pro 9".
If you never walk with the bag, a heavy one is a fair choice. The Pro 9" is for the days when the bag has to arrive with the rifle.
What about a flat, thin bag?
MDT lists the Traveler at 8" × 6" × 1", with Spex Lite at 8 oz or House Fill at 1 lb, $69.99. It is flatter and cheaper, and lighter with Spex Lite. Whether the weights are filled or empty is not stated. If your blind has a very low shelf, a flat bag is worth a look.
How do you carry it to the blind?
The bag rides on your sling or attaches directly, so it goes with the rifle from the truck. No sling comes with the bag. If the stock has no rear point, the All-Stock Adapter ($35.95, left or right hand) wraps the stock with a hook-and-loop strap and gives the bag a mounting point. The Pro 9" costs $89.99, comes in Black, Sand, Digital Camo or Woodland Camo, and has a three-layer build with an abrasion-resistant grip fabric on the contact face. It is made in the USA, and Sling Steady is a veteran-run company.
For the blind and the walk to it: the Pro 9"
Related reading: Field positions for hunters: where the rear bag fits · Hard or soft: setting bag firmness with SteadyFill · What is a rear squeeze bag?
Sling Steady is Ready When You Are.