To inspect a shelter, you should evaluate the color of the PVC bag, the readability of the PVC bag label, and the holes in the bag. If the bag has moisture in it, if the rebag label is yellow, if there is a red “R” on the white label, or if there are one to three holes about one inch big, then the fire shelter should be put out of service. Here is a comprehensive Fire Shelter Inspection Guide and Rebag Direction from the United States Department of Agriculture Forest Service Technology & Development Program.