Crates must be sharing at least one face in order to connect. (on a larger and oddly-shaped crate such as an L-shaped crate, adding a new single crate could potentially cause it to share up to 2 of it's faces with existing faces if placed in the corner, merging one larger crate with a single crate) Each additional crate adds 2 inventory spaces. Each inventory space is limited to 100 items for stackable items. Items cannot be added automatically using a conveyor system. Items cannot be removed except via player interaction.