sharpies reluctantly substituted when he can find no pens , yet a small cache of assorted socks unexpectedly appears , of which he grabs a couple varieties , and he further fleshes out the wish list with some good ol grease drenched potato chips ( both food and an excellent fire starter ) , the thickest trash bags money would have bought , a pocket knife , a roll of toilet paper , some notebooks , and fistfuls of beef jerky products .