A more compact way to store common items like leather and feathers was requested by a couple of players in the early days of planning the DiggyVerse 2 update, so here it is...
Storage Bags!
As you can see they are very cheap to craft, they are also infinitely reusable!
In total they can be used with 16 different items,
some vanilla and some from the Diggys Stuff 2 Mod.
To fill a bag you just place it in the centre of the crafting grid and surround it with the item you want to fill it with. As you probably realised that means each bag holds 8 items, essentially allowing you to compact 8 stacks into one for long term storage or selling via Vending Blocks in higher quantities!