 A small chain looped through a ring or two at the top of the binding was all that was necessary to make it portable.Finally, a fourth type of portable book was the "vade mecum" (go with me), consisting of a booklet or folded sheets that contained an almanac or medical information and could be suspended from a belt.The text on a vade mecum would be arranged in such a way as to be legible as someone unfolded the parchment, rather than having to constantly reorient the sheets.