Unbound Items

Unbound Items increases item stack sizes to four times their original capacity, up to a maximum of 256 items per stack. Items that normally stack to 16 can stack to 64, while items that stack to 64 can stack to 256. Tools, weapons, armor, and other equipment keep their normal stack sizes by default. Stack sizes can also be customized for individual items or entire item tags. Works in both singleplayer and multiplayer.