Generally they combine them the same as if you'd ordered together.
Conversely a single order can be split into separate shipments.
Amazon already figures out how to get orders to you most efficiently. If it can pack items together because they're in the same warehouse, it will. If items are necessarily coming from different locations it won't.
(And if you opt for slower shipping it will sometimes be able to combine items it wouldn't otherwise.)
Conversely a single order can be split into separate shipments.
Amazon already figures out how to get orders to you most efficiently. If it can pack items together because they're in the same warehouse, it will. If items are necessarily coming from different locations it won't.
(And if you opt for slower shipping it will sometimes be able to combine items it wouldn't otherwise.)