BetterStacking

BetterStacking is a simple but powerful QOL mod that allows vanilla items like Beds and Enchantment Books to be stacked, making aspects of the game easier and helping improve inventory management.

Vanilla:

BetterStacking:

As you can see with BetterStacking you can stack any item you want(yes any item, except for buckets)

With items like durability (e.g.. Flint and Steel) the stack is the stack, so if you use 1 it goes to 63 pretty simple, you cant do more as Minecraft doesn't allow that with mixins (as of my knowledge)