Backcountry. It is a very simple process. You cut a two inch hole using a hole saw. Keep the plug. Hammer a weight into a long ingot then place in the can. I added glue here to hold it
Mix a small batch of foam and pour it into the can. Allow it to set around the weight. Mix a but more and add it to tr can, moving the can slowly side to side to allow the foam to make it into te handles. Keep adding foam until about half full. Wait. If needed add more foam but it should fill the cavity. Replace the plug. Done
What questions do you have?