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If you combine a snail shell and a chest, you can craft a Snail Chest. These have four rows of slots instead of three, but no Large variant. 2/3

If you shift-click a Snail Chest, you can place it on your chest and move it around! You can't move it elsewhere in your inventory, so you can only carry one at a time. You might even find a Wandering Trader with a Snail Chest sometimes instead of Trader Llamas. 3/3