  <tag:items:crafttweaker:leather_material>.add(<item:minecraft:leather>,<item:minecraft:rabbit_hide>);
craftingTable.addShaped("backpacked_backpack_leather", <item:backpacked:backpack>, [[<tag:items:crafttweaker:leather_material>, <tag:items:crafttweaker:leather_material>, <tag:items:crafttweaker:leather_material>], [<tag:items:forge:string>, <tag:items:forge:ingots/iron>, <tag:items:forge:string>], [<tag:items:crafttweaker:leather_material>, <tag:items:crafttweaker:leather_material>, <tag:items:crafttweaker:leather_material>]]);

craftingTable.removeByName("backpacked:backpack");
 craftingTable.addShaped("luminous_beasts_bestiaryrecipe", <item:luminous_beasts:ultimate_bestiary>, [[<item:minecraft:air>, <item:minecraft:iron_ingot>, <item:minecraft:air>], [<item:minecraft:diamond>, <item:minecraft:book>, <item:minecraft:diamond>], [<item:minecraft:air>, <item:minecraft:iron_ingot>, <item:minecraft:air>]]);
craftingTable.removeByName("luminous_beasts:bestiaryrecipe");