I just made my own messenger bag back pad from an old 1/4” thick yoga mat. So grippy that it stays perfectly in place between the shell and tarp liner, no loss of inside space, mega-flexible, and totally cushy comfy. Absolutely perfect.
Books may not change our suffering, books may not protect us from evil, books may not tell us what is good or what is beautiful, and they will certainly not shield us from the common fate of the grave. But books grant us myriad possibilities: the possibility of change, the possibility of illumination.