Remove your sack of foam from the box along with the outer cover. Remove the foam from the canvas bag. DO NOT USE A KNIFE, SCISSORS OR OTHER SHARP INSTRUMENT TO REMOVE THE CLEAR BAG FROM THE FOAM BRICK AS THIS MAY RESULT IN DAMAGING THE INNER LINER!! Carefully remove the clear bag from around the foam brick. The foam will already be encased in the inner liner. Leave the foam inside the inner liner. Use your hands to break apart the brick of foam. The more you break apart the foam, the fuller your sack will get. You can also help to break the foam apart by moving the inner liner around and rotating it. Once the foam is broken your Ultimate Sack will have significantly increased in size. Then, you may zip your outer cover into place around the inner liner. Your Ultimate Sack will continue to expand and increase in size for several days after opening.