Skychest
A challenge mod that removes all blocks during world generation except for chests, barrels, furnaces, flower pots, and other forms of storage.
The Beginning
The Bonus Chest, where your journey begins.
Village
An example of Village generation. Those Furnaces are quite valuable!
Trail Ruins
Suspicious Sand and Gravel are containers too! Or at least, close enough.
Trial Chamber
Trial Chambers are the real jackpot, they're absolutely loaded with containers. You can even get Chickens from here!
Nether Fortress
The Nether is especially hostile. The only loot containers in the Nether are chests, and those only render when you're already very close to them.
Strongholds
Portal Frames are containers for Eyes of Ender, if you really think about it.
Exit Portal
Exit Portal generation is fixed so it doesn't generate only partially inside the world.
Elytra
Item Frames won't last long without a supporting block, but if you play your cards right, it is possible to get to the item before it despawns.