Special input for picking up storage containers.
Slowed, unable to jump, climb, sit, swim, or interact while carrying container. Right click to place container back down.
New Craftable Cart Entity - Not allowed to be placed in inventory or dropped as an item - exists only as an entity and crafted outside of the player's crafting grid (multiblock structure/external blueprint). Dragged by the player only for now, similar penalties to carrying containers. Movement difficult offroad. Can hold X containers or piles of any type with no inventory of its own.
New piles - Logs, ore, rocks, blocks, dirt, sticks, etc.
Chest/basket/urn/crate nerf - Disallow bulky items from being put into containers. Containers only for special misc items, food, seeds, etc. In general have it be more space efficient to use piles than chests for storage on applicable items.
New wheelbarrow entity for moving piles, can be picked up while empty like a container.