Do you suggest anything else for the backpack?
Well, you have to have the latest WT and Awake! magazines so you can read them to each other for encouragement while Armageddon churns your neighborhood to dust above your Armageddon shelter (I started to list the bible but then realized, silly me, they rely on WT publications, not the bible)
Brothers will need to keep a necktie and shaving kit in their backpack. When it's all over and they can come climbing out, the brothers will want to be clean-shaven and properly dressed to usher in the New System. Likewise Sisters will need to keep pantyhose and a modest dress ready.