Inventory Extras

Adds many conveniences to the player inventory.  Changes the 2x2 crafting table in the player inventory to a 3x3 crafting table, which fully works with the recipe book.  Adds a slot next to the off-hand, which can be used as a slot for Totems of Undying, arrows, or just an extra storage slot.  And lastly, it adds a slot for your elytra to allow you to wear it in conjunction with your chestplate.

Extra Storage Slot also compatible with Simple Ender Backpack:

https://www.curseforge.com/minecraft/mc-mods/simple-ender-backpack