Bundled Up

With this mod, you can use bundles exactly as they appear in the latest game snapshots. A bundle is an item that allows you to store different types of items in a single inventory slot. However, the total storage capacity doesn't increase - a bundle can hold up to 64 items.

Items with smaller maximum stack sizes take up proportionally more space in the bundle. For example, Ender Pearls will occupy 4 slots out of 64 possible. The mod almost perfectly implements this functionality.

You'll find bundles in the creative inventory and can craft them through the crafting table. The modification works on both client and server, with installation on either side being optional.