The Fire Shelter is an old model, being replaced last year with the new type. The back smuges in the corners of the plastic bag is aluminum dust from the coating on the fire shelter wearing off. This type of shelter is no longer allowed on fires. Geting into one needs training, but if you unfold the one you have, you will never get it folded up small enought to replace in the bag.(I know i'v tryed) The Yellow bag is good and will hold 2 MRE'S and brew kit.
You can always cut up the shelter and make signal panels or a reflector for a fire.