Description
Ever had half your hotbar taken up by ender pearls and snowballs? With this mod, everything that normally stacks to 16 stacks to 64 instead: ender pearls, eggs, snowballs, signs and hanging signs, empty buckets, banners, armor stands, honey bottles and written books. Items from other mods that stack to 16 are raised too.
Unofficial port of Why Stacks of 16? by LaidBackSloth, for NeoForge and Fabric on 1.21.1, 1.21.11, 26.2 and 26.3. Please report bugs here.

Config
config/wso16.json is created the first time you start the game. Here it is with buckets left at 16:
{
"stackSize": 64,
"exclude": ["minecraft:bucket"]
}
stackSizeis what those items stack to instead. Anything from 1 to 99 works.- Items listed in
excludestay at 16. - Changes take effect after a restart.
FAQ
Client or server? Both. The server and every player need the mod, with the same config, or stacks will look wrong in the inventory.
Does it need anything else? Fabric API on Fabric. Nothing on NeoForge.
Can I use it in my modpack? Yes, go ahead, no need to ask.
MIT. Developed with AI assistance. Source: https://github.com/traelmyx/why-stacks-of-16-reborn