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An opinionated backport of the bundle scrolling and dyeing mechanics from 1.21.2. The UI is unchanged (other than showing which slot is selected), so you still can see all the items.
!Scrolling through the slots of a bundle
!All 17 bumdle colors
/datapack enable "bundle-backportish:rabbithide" or in the world creation menu which lets you craft it with either leather or rabbit hide.Contains integration with EMI to show the bundle dyeing recipes, as they are NBT crafting and wouldn't show up normally.
Works with Mouse Tweaks: scrolling will change bundle selection instead of extracting items
Also check out Backbundled if you're looking for a more accurate backport of vanilla bundles
Scrolling implementation based on Bundle Tweaks by zacharybarbanell (MIT License)

A backport of bundle mechanics using the original UI