If one takes the time to re-configure a Doug Ritter psk,one will find that instead of subtracting from the kit,(as every piece in there was Extremely well thought out to begin with)there will be Plenty of room for additional items.Another foil tip:In lieu of coffee or other substances used to stay awake,roll a small piece of foil into a ball,& put it in your mouth & roll it around like a Lifesaver/Lozenge,it will keep you alert for sometime,Indeed!Foil is too Universal to discard!