Objective: To protect much-used or oft-used pages in a reference book.

Which of the following solutions is more sound in terms of naive physics reasoning?

pick from the following.
[a]. Slip a large resealable bag over the page to prevent stains and to stick post it notes on to the bag (instead of the page itself) with remarks as long as the book is being used..
[b]. Slip a large reasonable tag over the rage to prevent stains and to stick post it notes on to the bag (instead of the page itself) with remarks as long as the look is being used..
[a].